{"product_id":"apera-do8500-10-ft-optical-dissolved-oxygen-meter-kit","title":"Apera DO8500 Portable Optical Dissolved Oxygen Meter Kit, 10-ft Cable | AI485","description":"\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:1400px;margin:0 auto;color:#26332C;font-size:1rem;line-height:1.75;\" id=\"bts-do8500-description\"\u003e\n\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(20px,4vw,48px);border:1px solid #B7D0BF;background:#F1F7F3;border-radius:14px;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#245B45;margin:0 0 12px;\"\u003eAPERA INSTRUMENTS \/ DO8500 \/ AI485\u003c\/p\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eOptical DO with salinity compensation and a record of the round\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eDO8500 adds timestamped storage and automatic salinity compensation to a portable optical DO workflow. The AI485 kit includes the DO803 optical probe with nominal 10-ft cable, a separate salinity electrode and a clip for measuring together. It is designed for general-water sampling where salinity changes and saved results both matter.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eChoose DO8500 when manual or timed storage and a salinity input measured by the included electrode are useful. The salinity electrode supports DO compensation; this is not a general pH\/EC multiparameter kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 optical DO meter with nominal 10-ft cable and supplied probes\" width=\"1100\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:340px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eAI485: DO8500 with DO803 and separate salinity electrode joined by the clip. Exact 10-ft kit page photograph; cable length is established by SKU and manual, not inferred from the coiled cable.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdetails id=\"bts-core6-kit-guide\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;border:1px solid #FF931A;border-radius:10px;margin:24px 0;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;justify-content:space-between;gap:16px;padding:20px;background:#FF931A;color:#172b4d;border-radius:10px;cursor:pointer;line-height:1.5;\"\u003e\u003cspan style=\"flex:1;min-width:0;\"\u003e\u003cspan style=\"display:block;font-size:clamp(17px,2.6vw,21px);font-weight:700;\"\u003eWhich meter kit fits my measurement?\u003c\/span\u003e\u003cspan class=\"bts-sp-when-closed\" style=\"display:block;font-size:.88rem;margin-top:5px;\"\u003eClick or tap to compare all six measurement configurations\u003c\/span\u003e\u003cspan class=\"bts-sp-when-open\" style=\"font-size:.88rem;\"\u003eClick or tap here to close the guide\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"bts-sp-toggle\" aria-hidden=\"true\" style=\"flex:0 0 38px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:white;font-size:27px;\"\u003e\u003c\/span\u003e\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:20px;\"\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eEach card opens that model page. Match the supplied electrode and documented sample method. pH, conductivity and optical dissolved oxygen are different measurements. Match the parameter and meter format before comparing accessories; optional items are not supplied unless the exact kit list says so.\u003c\/p\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:14px;\"\u003e\n\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"PH910\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph910-benchtop-ph-meter-kit\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:1px solid #e0e0e0;background:white;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph910-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera PH910\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003ePH910\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI5610\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eBenchtop pH with records\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003eLabSen 211 pH-only electrode and separate MP500 temperature probe.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eView PH910 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"EC910\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ec910-benchtop-conductivity-meter-kit\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:1px solid #e0e0e0;background:white;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ec910-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera EC910\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003eEC910\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI5612\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eBenchtop conductivity with records\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003e2301T-F cell and model-specific USB record workflow.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eView EC910 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"PC910\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-pc910-benchtop-ph-conductivity-meter-kit\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:1px solid #e0e0e0;background:white;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-pc910-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera PC910\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003ePC910\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI5614\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eBenchtop pH and conductivity\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003eSeparate pH and EC probes, each with its own temperature input.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eView PC910 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"EC700\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ec700-benchtop-conductivity-meter-kit\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:1px solid #e0e0e0;background:white;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ec700-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera EC700\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003eEC700\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI502\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eStraightforward conductivity bench\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003e2301T-F cell and local 50-set recall, without documented USB export.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eView EC700 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"DO850\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-do850-10-ft-optical-dissolved-oxygen-meter-kit\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:1px solid #e0e0e0;background:white;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera DO850\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003eDO850\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI480\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eDirect optical dissolved oxygen\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003e10-ft DO803 optical probe; stable display and external recordkeeping.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eView DO850 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-core6-kit-link\" data-core6-kit=\"DO8500\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-do8500-10-ft-optical-dissolved-oxygen-meter-kit\" aria-current=\"page\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;align-items:flex-start;gap:14px;flex:1 1 300px;min-width:0;padding:18px;border:2px solid #FF931A;background:#FFF9F0;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666\u0026amp;width=200\" alt=\"Apera DO8500\" width=\"72\" height=\"72\" loading=\"lazy\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1;min-width:0;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:700;line-height:1.3;margin:0 0 4px;color:#245B45;\"\u003eDO8500\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.76rem;margin:0 0 9px;\"\u003eAI485\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.95rem;font-weight:600;line-height:1.5;margin:0 0 6px;\"\u003eOptical DO with recording\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;margin:0 0 12px;\"\u003e10-ft optical probe plus salinity electrode and documented logging.\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:inline-block;padding:6px 9px;border-radius:5px;background:#FFF0DD;font-size:.85rem;font-weight:700;\"\u003eCurrent item\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eChoose the electrode for the sample.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:16px;\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eOptical sensing without oxygen consumption\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eA blue LED excites the luminescent layer; a photodiode detects its red optical response. The probe does not consume oxygen, so measurement does not require continuous sample movement. Still remove bubbles, inspect the cap and allow temperatures to equalize. Optical design is not a guarantee of immediate readings in every sample.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eSalinity compensation has its own electrode\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe included 2301-3M conductivity electrode supplies the salinity input used for automatic DO compensation. Connect it and choose automatic mode; use the combined clip to measure with the DO probe. Manual entry from 0 to 45 ppt remains available. Do not assume the optical probe alone measures salinity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eRead status before saving\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe LCD distinguishes a stable reading, HOLD, M+ saving, RM recall, timed storage and USB communication. The manual shows salinity when its probe is connected and salinity exceeds 1 ppt. HOLD is a reading lock, separate from the commands that actually store records.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eField handling with a serviceable sensor\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe IP57 instrument has a backlight and folding stand, and travels in a carrying case. The DO803 integrates temperature sensing and uses a replaceable optical cap. Protect connectors and seals, and keep the cable clear of sharp edges. The ingress rating does not make every accessory or connected computer waterproof.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eKnow what this configuration supplies.\u003c\/h2\u003e\n\u003cdiv aria-label=\"Included item table\" role=\"region\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;overflow-x:auto;width:100%;max-width:100%;\" tabindex=\"0\"\u003e\u003ctable style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;border-collapse:collapse;font-size:1rem;border:1px solid #e0e0e0;table-layout:fixed;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eIncluded item\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOrder contents\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eDO8500 portable optical DO meter\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne instrument, exact US kit SKU AI485.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eDO803 optical DO probe\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne temperature-sensing optical probe with fitted cap and nominal 10-ft cable.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eCalibration\/storage sleeve and sponges\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne DO8031 sleeve; four spare water-storage sponges.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003e2301-3M salinity electrode and combined clip\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne conductivity electrode for salinity compensation and one clip for paired measurement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003ePC-Link flash drive and USB cable\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne of each listed in the exact manual. Host compatibility requires confirmation; computer is not included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:32%;font-weight:600;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eScrewdriver, case and instructions\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;min-width:0;\"\u003eOne small screwdriver, one carrying case and one manual. The meter uses three AA batteries; the linked packing list does not separately enumerate batteries or salinity calibration solution.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-kit-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-kit-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-kit-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-kit-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 kit in an open carrying case\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eManufacturer photograph from the exact 10-ft kit page. Use the itemized kit list for included components, rather than counting hidden pieces in the case.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eMatch the sample and preparation method.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;gap:16px;\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eBrackish-water and marine checks\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eAutomatic salinity compensation reduces repeated manual entries when moving among waters of different salinity. It depends on the connected, functioning salinity electrode and the selected mode. Record sampling depth and temperature so comparisons reflect a consistent procedure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eTreatment-process sampling rounds\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eStore readings with date and time at successive locations, then preserve location identifiers in your own records. Timed recording can follow a defined sampling interval; it does not by itself establish sample representativeness or replace an installed process sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 240px;min-width:0;padding:24px;background:#fff;border:1px solid #DCE6DF;border-radius:10px;\"\u003e\n\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.07rem;font-weight:600;color:#245B45;margin:0 0 12px;\"\u003eGeneral-water laboratory comparisons\u003c\/h3\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe stand and probe clip support repeated bench checks. Use compatible aqueous samples within 0 to 50°C. DO803 is not specified for strong acid, strong alkali or organic solutions; determine suitability before applying it to aggressive process liquids.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"optical-principle\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-optical-principle-20261016-core6.webp?v=1792167666\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-optical-principle-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-optical-principle-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-optical-principle-20261016-core6.webp?v=1792167666\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original optical DO principle diagram showing blue excitation and red luminescence\" width=\"1100\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal manufacturer principle illustration: the blue LED excites the sensing layer and the photodiode detects red luminescence. This explains the design, not a test result or an exact immersion-depth drawing.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003ePrepare the DO and salinity paths separately\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eConnect the DO803 eight-pin plug, secure the connector and inspect the sensing cap. Allow about 30 seconds after power-on before operations. Check the clock if storing data. Select automatic or manual salinity compensation deliberately; automatic mode requires the salinity electrode to be connected, not merely a setting change.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe salinity electrode is factory calibrated. The manual calls for recalibration when it is replaced or has not been used for a long time. In automatic mode use the specified 12.88 mS\/cm conductivity standard in the salinity calibration menu, allow the reading to stabilize, then confirm. This standard is for the salinity electrode, not the optical DO saturated-air point.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eFor DO calibration, use the storage sleeve with a damp, non-dripping sponge. Keep water droplets off the sensor cap and wait five to ten minutes for humidity and temperature to stabilize. Confirm the saturated-air calibration only after the stability icon remains visible. The manual recommends daily saturated-air calibration for optimal accuracy, despite promotional suggestions of infrequent calibration.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eZero calibration is factory performed and normally unnecessary on initial use. It is specified after probe or cap replacement, prolonged non-use, or for demanding work at 0 to 2.0 ppm. Follow the manual’s fresh sodium-sulfite solution procedure. For measurements remove the sleeve, immerse above the marked line, briefly dislodge bubbles and wait for stability. Full equilibration can take about one to three minutes; the 30-second specification is only 90% response at 25°C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"sensor-assembly\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-sensor-assembly-20261016-core6.webp?v=1792167666\u0026amp;width=984\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-sensor-assembly-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-sensor-assembly-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-sensor-assembly-20261016-core6.webp?v=1792167666\u0026amp;width=984 984w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original numbered DO803 sensor and calibration sleeve assembly diagram\" width=\"984\" height=\"460\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:620px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal manual diagram. Legend: 1 sleeve bottom cover; 2 water-storage sponge; 3 sensor cap; 4 calibration\/storage sleeve; 5 locking cap; 6 optical probe; 7 O-ring. For saturated-air calibration keep the sponge damp, not dripping, and keep droplets off the sensing face.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"immersion-line\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-immersion-line-20261016-core6.webp?v=1792167666\u0026amp;width=176\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-immersion-line-20261016-core6.webp?v=1792167666\u0026amp;width=176 176w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original DO803 immersion-line drawing\" width=\"176\" height=\"174\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:176px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal manual depth guide: during sampling the water must be above the marked immersion line. Remove the storage sleeve for measurement. This is not the humid-air calibration arrangement.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"salinity-calibration\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-calibration-20261016-core6.webp?v=1792167666\u0026amp;width=740\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-calibration-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-calibration-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-calibration-20261016-core6.webp?v=1792167666\u0026amp;width=740 740w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original three-step DO8500 salinity calibration screen sequence\" width=\"740\" height=\"870\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:620px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal screens from manual Figure 13, arranged vertically for small displays. Select automatic salinity mode, use 12.88 mS\/cm conductivity standard for the salinity electrode and confirm after stability. These are salinity calibration screens, not the optical DO saturated-air calibration.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eUnderstand the sensing end and connections.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:24px;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 300px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-probe-detail-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-probe-detail-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-probe-detail-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-probe-detail-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO803 optical probe sensing end with stainless-steel cap\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:480px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eDO803 sensing end, shown without its storage sleeve. Protect the optical coating from scratching; do not exceed 50°C.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eKeep the cap humid, clean and protected\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe optical cap needs humid storage, not pH-electrode KCl solution. Keep the DO8031 sleeve sponge damp with clean water, not dripping, and close the locking cap. The sensing cap should sit in humid air rather than a pool of water inside the sleeve. Replace a dirty or moldy sponge. For storage beyond 30 days, the manual permits clean-water storage or checking the sleeved sponge every 30 days.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eIf the sponge has dried or the probe has spent over eight hours in dry air, rehydrate before measuring. The detailed maintenance instructions specify 24 hours in clean water at room temperature, or 48 to 72 hours in cold water. During measurement, remove the sleeve and immerse above the marked immersion line. Do not confuse that sampling depth with the humid-air calibration arrangement.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eProtect the cap coating from scratches and temperatures above 50°C. Clean gently with a soft clean cloth; do not use alcohol or organic solvents. The manual describes 3% hydrogen peroxide for 15 to 30 minutes when disinfection is needed, followed by a clean-water rinse. Do not routinely remove or swap sensor caps; keep the interior dry and uncontaminated.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eDO8032 is the replacement luminescent cap. Its advertised 8,000-hour service figure is a design estimate, not a guaranteed interval or warranty duration. Replacement requires the correct cap calibration coefficients. The current replacement page describes a probe-connected data box and installation-program flash drive, while the meter manual refers to cap-specific calibration codes. Follow the supplied replacement instructions; neither source establishes a QR-code or RFID procedure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-storage-sleeve-20261016-core6.webp?v=1792167666\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-storage-sleeve-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-storage-sleeve-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-storage-sleeve-20261016-core6.webp?v=1792167666\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8031 storage and calibration sleeve with sponge at its base\" width=\"1100\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eThe DO8031 sleeve creates humid air around the sensing cap. Dampen the sponge with clean water; do not fill the sleeve so the sensing cap sits in water. Inspect and replace dirty or moldy sponges.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"replaceable-cap\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-replaceable-cap-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-replaceable-cap-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-replaceable-cap-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-replaceable-cap-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original DO803 exploded photo with luminescent cap removed\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal DO8032 service illustration, not normal storage: remove the cap only for appropriate service, keep the interior dry and follow the replacement instructions. No conventional membrane or electrolyte refill is needed.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"cap-coefficient-service\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-cap-coefficient-service-20261016-core6.webp?v=1792167666\u0026amp;width=952\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-cap-coefficient-service-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-cap-coefficient-service-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do850-cap-coefficient-service-20261016-core6.webp?v=1792167666\u0026amp;width=952 952w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO803 replacement-cap data box connected between probe and a computer\" width=\"952\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eReplacement-cap programming illustration from the DO8032 accessory page. It shows a data box connected to the probe and a computer; it is not ordinary meter data export. Computer and cap-service equipment are not listed as included in the meter kit. Confirm the supplied cap procedure and host requirements.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:24px;\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 300px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"display-guide\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-display-guide-20261016-core6.webp?v=1792167666\u0026amp;width=794\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-display-guide-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-display-guide-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-display-guide-20261016-core6.webp?v=1792167666\u0026amp;width=794 794w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original DO8500 LCD guide with numbered status icons\" width=\"794\" height=\"568\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:420px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal LCD legend: 1 mode; 2 reading; 3 timed storage; 4 date\/time; 5 date\/time units; 6 measurement units; 7 temperature units; 8 calibration units; 9 storage number; 10 M+ save and RM recall; 11 temperature; 12 HOLD; 13 ATC\/MTC; 14 stability; 15 USB; 16 low battery. This diagram shows possible segments, not a sample reading.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 300px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"salinity-display\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-display-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-display-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-display-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-salinity-display-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 display with salinity value highlighted\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:420px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal manufacturer DO8500 example: the lower-right salinity value is highlighted. Automatic salinity compensation requires the included separate electrode and automatic mode; the optical probe alone does not measure salinity.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 300px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"pressure-compensation\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pressure-compensation-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pressure-compensation-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pressure-compensation-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pressure-compensation-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 pressure compensation menu example\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:420px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal DO8500 P3.5 pressure-calibration display. Automatic barometric compensation operates over 60 to 120 kPa. The example number is not a measured value for your location.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 300px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-folding-stand-20261016-core6.webp?v=1792167666\u0026amp;width=935\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-folding-stand-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-folding-stand-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-folding-stand-20261016-core6.webp?v=1792167666\u0026amp;width=935 935w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 supported on its folding rear stand\" width=\"935\" height=\"1100\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:420px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal exact DO8500 feature-panel photograph showing the folding stand. Secure the instrument and cables on a stable surface; the stand does not secure the probes in a sample.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eRead the display. Check the measurement mode.\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eUse the physical controls for measurement, calibration and the documented record functions. Check units, temperature, calibration indicators and the selected parameter before assigning a result to a sample. Screen values in photographs are illustrative, not sample results. The model-specific record and output workflow is explained below.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eFollow the exact parameter-specific calibration procedure, using the required standard, solution or calibration atmosphere. Temperature compensation does not make different sample temperatures, preparation methods or chemistry equivalent. Follow the model-specific meter and electrode instructions before extending the method to a new sample.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\n\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003e500 records, with a model-specific legacy USB route\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eDO8500 stores up to 500 groups with date and time. Use manual saving for individual samples or set the automatic timing interval for a series. Manual saving is unavailable while timed-storage mode is active. Check the clock before collecting a batch, review records with RM and export before clearing the complete memory.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThe exact manual documents DO8500 PC-Link, a Windows driver and COM-port connection, Download and Export to a Microsoft Excel file. In connected real-time operation, readings are sent to the computer rather than retained in meter memory. Keep the computer session and exported file under your own record-retention procedure.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eThis is the legacy DO8500 workflow, not evidence of compatibility with 9500 software, 480-series software or a browser-based PC-Link service. Verify the delivered meter revision and host-system requirements before purchase if USB use is essential. No software installation, startup or compatibility test is implied, and the kit is not represented as compliance-certified data management.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;flex:1 1 340px;min-width:0;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"usb-connection\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-usb-connection-20261016-core6.webp?v=1792167666\u0026amp;width=912\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-usb-connection-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-usb-connection-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-usb-connection-20261016-core6.webp?v=1792167666\u0026amp;width=912 912w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"DO8500 connected to a computer by USB\" width=\"912\" height=\"941\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eOriginal DO8500 USB illustration. Up to 500 timestamped groups are supported; the exact manual describes legacy PC-Link. Computer not included. This is not evidence of browser support or validated compliance software.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003cfigure style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:620px;margin:0 auto;min-width:0;\" data-mfr-feature=\"pclink-screen\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pclink-screen-20261016-core6.webp?v=1792167666\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pclink-screen-20261016-core6.webp?v=1792167666\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pclink-screen-20261016-core6.webp?v=1792167666\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-pclink-screen-20261016-core6.webp?v=1792167666\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Original DO8500 legacy PC-Link software screen\" width=\"1106\" height=\"859\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:500px;height:auto;object-fit:contain;box-sizing:border-box;margin:0 auto;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eLegacy manual interface, not a compatibility test. Legend: 1 stored values; 2 mode and serial number; 3 parameter information; 4 port and command controls. Download transfers saved meter records; Export writes an Excel file. Connected live records go to the PC rather than meter memory.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(28px,5vw,56px) 0;border-bottom:1px solid #B7D0BF;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eComplement your water-quality workflow.\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eRelated workflow: \u003ca href=\"https:\/\/bluetigerscientific.com\/products\/apera-instruments-tn420-portable-white-light-turbidity-meter-epa-180-1-compliant\" style=\"color:#245B45;text-decoration:underline;font-weight:600;\"\u003eApera TN420 Portable White-Light Turbidity Meter\u003c\/a\u003e. Turbidity and dissolved oxygen describe different water-quality properties; this link is a separate workflow, not a compatible accessory or interchangeable measurement. Compare the exact supplied sensors, measurement parameter, accessories and data features rather than assuming similar model names mean identical kits.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:28px 0;line-height:1.15;\" id=\"bts-do8500-faq\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.1rem;font-weight:600;margin:0 0 16px;\"\u003eDO8500 buyer questions\u003c\/h2\u003e\n\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eWhich exact configuration is this?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eAI485 is the nominal 10-ft DO8500 kit, with DO803 and a separate salinity electrode. The manual calls the optical cable 3 m. This is not the AI48533 33-ft configuration.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eWhat are the DO and temperature ranges?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eThe meter covers 0 to 20.00 mg\/L or ppm, 0 to 200.0% saturation and 0 to 50°C. Salinity compensation covers 0 to 45 ppt; automatic pressure compensation covers 60 to 120 kPa.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eIs the salinity sensor included or optional?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eIncluded. The manual identifies the supplied electrode as 2301-3M and also lists a combined electrode clip. Automatic compensation requires that sensor to be connected and automatic mode selected.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eDoes it measure pH and general conductivity?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eNo pH measurement is specified. The conductivity electrode supports salinity compensation of DO; do not treat this as a general-purpose pH\/EC kit.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eHow much data can it save?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eUp to 500 timestamped groups, using manual or timed storage. HOLD alone does not save a record. Connected real-time PC-Link acquisition is described as storing on the computer, not in the meter.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eWill USB work in a modern browser?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eBrowser support is not established by the exact DO8500 sources. Its manual documents legacy Windows PC-Link and a COM-port\/driver workflow. Confirm current host compatibility for your meter revision.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eDoes the cap last a guaranteed 8,000 hours?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eNo. That is a service-life design estimate, not a guaranteed duration. Coating damage, unsuitable cleaning and dry storage can affect performance. Replacement also requires the correct calibration coefficients.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e0e0e0;border-radius:8px;margin-bottom:10px;background:white;\"\u003e\u003csummary style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:14px 16px;cursor:pointer;font-weight:600;font-size:1rem;line-height:1.15;\"\u003eWhat warranty applies?\u003c\/summary\u003e\u003cdiv style=\"padding:0 16px 14px;\"\u003e\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.97rem;line-height:1.6;margin:0;\"\u003eThe current exact kit page states three years for the instrument, two years for the DO803 probe excluding its cap, and one year for the DO8032 cap, from purchase. Coverage concerns material or manufacturing defects; improper use, normal wear, accidental damage, storage, transportation and unauthorized repair are excluded. The service-hour estimate is not a warranty. The linked DO8500 manual instead dates cap coverage from delivery; confirm the applicable terms for your purchase.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003c\/section\u003e\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:28px;background:#F1F7F3;border:1px solid #B7D0BF;border-radius:12px;\"\u003e\u003ch2 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:clamp(24px,4vw,34px);font-weight:600;line-height:1.2;letter-spacing:-.02em;color:#245B45;margin:0 0 20px;\"\u003eConfirm the exact configuration before ordering.\u003c\/h2\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1rem;line-height:1.75;margin:0 0 16px;\"\u003eReview DO8500 AI485 against the sample, supplied electrode and documented method. Return to the live price and ordering controls when the configuration fits your work.\u003c\/p\u003e\n\u003ca href=\"#\" style=\"color:#245B45;text-decoration:underline;font-weight:600;\"\u003eBack to price and ordering ↑\u003c\/a\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Apera Instruments","offers":[{"title":"Default Title","offer_id":52968219214122,"sku":"BTS-AI485","price":1350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do8500-hero-20261016-core6.webp?v=1792167666","url":"https:\/\/bluetigerscientific.com\/products\/apera-do8500-10-ft-optical-dissolved-oxygen-meter-kit","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}