{"product_id":"apera-ph8500-sa-portable-strong-alkali-high-salinity-ph-meter-kit","title":"Apera PH8500-SA Portable pH Meter Kit with LabSen 843 and GLP Data Logging for Strong Alkali and High Salinity","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-ph8500-sa-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 \/ PH8500-SA \/ AI5523\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;\"\u003eStrong alkali and high salinity.\u003cbr\u003eStart with the right glass.\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 PH8500-SA pairs Apera’s portable, USB-enabled PH8500 meter with the Swiss LabSen 843 refillable pH\/temperature electrode. Apera designs the 843 for high-precision pH measurement of strong alkaline solutions (pH 10–14) and high-salinity solutions, using an HA-type glass membrane to minimize alkaline error and a silver-ion-trap reference to prevent junction clogs.\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 AI5523 when the sample chemistry, rather than portability alone, decides the electrode. Apera lists the supplied LabSen 843 at 2–14 pH and 0–100°C for this kit. Those are the electrode’s working limits, not the meter’s wider −2.00 to 16.00 pH display range. Automatic temperature compensation corrects the electrode response; it does not stop a caustic sample from absorbing carbon dioxide from air.\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-ph8500-sa-hero-20261017-harsh.webp?v=1792215984\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-sa-hero-20261017-harsh.webp?v=1792215984\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-sa-hero-20261017-harsh.webp?v=1792215984\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-sa-hero-20261017-harsh.webp?v=1792215984\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Apera PH8500 portable meter with the supplied LabSen 843 pH\/temperature electrode\" width=\"1600\" height=\"1600\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:460px;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;\"\u003ePH8500 meter with the supplied LabSen 843. Display values are illustrative, not a sample result.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdetails id=\"bts-8500-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 8500 portable configuration fits my work?\u003c\/span\u003e\u003cspan class=\"bts-sp-when-closed\" style=\"display:block;font-size:.88rem;margin-top:5px;\"\u003eClick or tap to compare all nine configurations, including harsh-chemistry kits\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 aria-hidden=\"true\" class=\"bts-sp-toggle\" 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. Different configurations are not interchangeable upgrades, and optional accessories are not supplied unless the exact kit contents say 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-8500-kit-link\" data-8500-kit=\"PH8500\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-portable-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 alt=\"Apera PH8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500\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;\"\u003eAI5520\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;\"\u003eGeneral portable pH\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;\"\u003e201T-F general-water pH\/temperature electrode.\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 PH8500 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"EC8500\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ec8500-portable-conductivity-tds-salinity-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 alt=\"Apera EC8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ec8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003eEC8500\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;\"\u003eAI5522\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;\"\u003eConductivity and derived values\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-S K=1 conductivity\/temperature electrode.\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 EC8500 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PC8500\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-pc8500-portable-ph-conductivity-tds-salinity-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 alt=\"Apera PC8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-pc8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePC8500\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;\"\u003eAI5524\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;\"\u003eSeparate pH and EC workflows\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;\"\u003e201T-F and 2301T-S, two distinct electrodes.\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 PC8500 →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PH8500-PW\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-pw-portable-pure-water-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 alt=\"Apera PH8500-PW\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-pw-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-PW\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;\"\u003eAI5556\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;\"\u003eLow ionic strength water\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 803 refillable sleeve-junction electrode.\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 PH8500-PW →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PH8500-WW\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-ww-portable-wastewater-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 alt=\"Apera PH8500-WW\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-ww-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-WW\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;\"\u003eAI5559\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;\"\u003eSuspensions and wastewater\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 333 open-junction polymer-reference electrode.\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 PH8500-WW →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PH8500-MS\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-ms-portable-semi-micro-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 alt=\"Apera PH8500-MS\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-ms-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-MS\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;\"\u003eAI5554\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;\"\u003eSmall-volume samples\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 243-6 plus included semi-micro container.\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 PH8500-MS →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#245B45;margin:24px 0 12px;padding-bottom:6px;border-bottom:2px solid #B7D0BF;\"\u003eHarsh-chemistry kits\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-8500-kit-link\" data-8500-kit=\"PH8500-HF\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-hf-portable-strong-acid-hf-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 alt=\"Apera PH8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-HF\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;\"\u003eAI5525\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;\"\u003eStrong acid \u0026amp; HF\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 833: HF-type glass, ceramic junction.\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 PH8500-HF →\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/a\u003e\n\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PH8500-SA\" aria-current=\"page\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-sa-portable-strong-alkali-high-salinity-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:2px solid #FF931A;background:#FFF9F0;border-radius:9px;text-decoration:none;color:#26332C;\"\u003e\u003cimg alt=\"Apera PH8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-SA\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;\"\u003eAI5523\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;\"\u003eStrong alkali \u0026amp; high salinity\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 843: HA (high-alkali) glass, ceramic junction.\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\u003ca class=\"bts-8500-kit-link\" data-8500-kit=\"PH8500-HT\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-ht-portable-high-temperature-caustic-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 alt=\"Apera PH8500\" height=\"72\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-hero-20261015-8500.webp?v=1792098186\u0026amp;width=200\" style=\"width:72px;height:72px;flex:0 0 72px;object-fit:contain;background:white;\" width=\"72\"\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;\"\u003ePH8500-HT\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;\"\u003eAI5566\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;\"\u003eHot, complex \u0026amp; caustic liquids\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 863: PHY glass, PTFE ring junction.\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 PH8500-HT →\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;\"\u003eHA-type glass for strong alkalis\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;\"\u003eOrdinary pH glass responds partly to sodium ions at high pH, so readings drift low. Apera specifies an HA-type membrane on the LabSen 843 to minimize that alkaline error in pH 10–14 samples. The membrane is a hemispherical bulb; protect it from impact and keep it hydrated.\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;\"\u003eSilver-ion-trap reference, ceramic junction\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 reference system traps silver ions before they reach the ceramic junction, which Apera describes as preventing junction clogs. The junction still needs clean samples, rinsing and wet storage; a protected reference does not make the junction maintenance-free.\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;\"\u003eRefillable, with a built-in temperature 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 843 uses 3M KCl reference solution that you top up through the refill hole, and a 30 kΩ NTC sensor wired to a separate RCA plug. Connect both the BNC and RCA leads so the PH8500 can display sample temperature and apply automatic compensation.\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\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;\"\u003ePH8500 portable 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 pH\/mV\/temperature meter with folding stand and IP57 enclosure.\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;\"\u003eLabSen 843 pH\/temperature electrode\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 refillable electrode (replacement AI3179) with storage bottle, BNC pH lead and RCA temperature lead.\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;\"\u003epH buffer solutions\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;\"\u003epH 4.00, 7.00 and 10.01, 50 mL each, per the PH8500 kit list. The pH 12.45 buffer is sold separately.\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;\"\u003ePC-Link software flash drive\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;\"\u003eDesktop software; the browser-based Web PC-Link is also supported.\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;\"\u003eUSB communication 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;\"\u003eFor data transfer and 5 V USB power.\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;\"\u003ePortable carrying case\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;\"\u003eApera lists the kit with case at 360 × 270 × 76 mm and 1.6 kg.\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;\"\u003eUser manual\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;\"\u003eMeter instructions; the LabSen 843 manual is linked under Manuals\/Brochures.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp 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;\"\u003eKit list follows the PH8500 manual, with the LabSen 843 supplied in place of the general-purpose 201T-F. Packing layout can vary by production revision.\u003c\/p\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-electrode-guide-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-electrode-guide-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-electrode-guide-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-electrode-guide-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"PH8500 manual table recommending LabSen 843 for high salinity and strong alkaline solutions\" width=\"1395\" height=\"592\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:560px;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;\"\u003eFrom the PH8500 manual’s electrode guide: Apera assigns the LabSen 843 to high-salinity and strong alkaline solutions, and the LabSen 863 to high-temperature, complex and caustic solutions.\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;\"\u003eWhere this configuration fits.\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 PH8500-SA for strong alkaline solutions in the pH 10–14 region and for high-salinity samples where a general-purpose electrode is likely to read low. Typical examples are caustic cleaning and process solutions, alkaline reagents and brines, measured within the electrode’s 2–14 pH and 0–100°C limits.\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 sample is also hot, complex or an electroplating bath, compare the \u003ca href=\"\/products\/apera-ph8500-ht-portable-high-temperature-caustic-ph-meter-kit\" style=\"color:#245B45;text-decoration:underline;font-weight:600;\"\u003ePH8500-HT with LabSen 863\u003c\/a\u003e. For strong acids and fluoride-containing samples, the \u003ca href=\"\/products\/apera-ph8500-hf-portable-strong-acid-hf-ph-meter-kit\" style=\"color:#245B45;text-decoration:underline;font-weight:600;\"\u003ePH8500-HF with LabSen 833\u003c\/a\u003e is the matching configuration. Apera’s manual advises against using the 843 in strong acids and dehydrating media such as absolute ethanol or concentrated sulfuric acid.\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-calibration-table-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-calibration-table-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-calibration-table-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-calibration-table-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"PH8500 manual Table 5 three-point calibration mode with 10.01 and 12.45 pH options\" width=\"1375\" height=\"688\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:560px;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;\"\u003ePH8500 manual Table 5. For samples above pH 7.00, use Option B: 7.00 pH first, then 10.01 or 12.45 pH.\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;\"\u003eCalibrate above pH 7.\u003cbr\u003eThen measure a stable sample.\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 electrode’s BNC plug to the pH input and the black RCA plug to the temperature input. Twist off the storage bottle cap, pull out the electrode, rinse it with distilled or deionized water and open the blue rubber plug on the refill hole so the reference solution flows smoothly.\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;\"\u003eApera specifies at least a two-point calibration before a new electrode is used. The PH8500 always starts at 7.00 pH (6.86 pH in the NIST series). For alkaline work, the manual’s Option B adds 10.01 pH or 12.45 pH as the second point, and a three-point calibration can use 4.00, 7.00 and 10.01 or 12.45 pH. The kit supplies 4.00, 7.00 and 10.01 pH; add 12.45 pH buffer when your samples sit near the top of the range.\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;\"\u003eImmerse the bulb and junction, stir gently and wait for the stability icon before saving. Strong bases absorb carbon dioxide from air and drift downward, so keep samples covered and measure promptly. Strong alkali is corrosive: wear eye and skin protection.\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-recalibrate-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-recalibrate-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-recalibrate-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-manual-recalibrate-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"PH8500 manual list of conditions that require recalibration\" width=\"1500\" height=\"270\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:760px;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 PH8500 manual requires recalibration after strongly alkaline samples above pH 12.00, after a new electrode is connected and when sample and buffer temperatures differ significantly.\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: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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-parts-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-parts-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-parts-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-parts-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"LabSen 843 manual diagram labeling the refill-hole plug, storage bottle cap, measuring tip, storage bottle and RCA and BNC connectors\" width=\"1320\" height=\"1413\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:520px;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;\"\u003eLabSen 843 manual diagram: refill-hole rubber plug, storage bottle cap, measuring tip and storage bottle, with separate RCA (temperature) and BNC (pH) connectors.\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\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-labsen843-tip-20261017-mfr.webp?width=850\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-tip-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-tip-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-tip-20261017-mfr.webp?width=850 850w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Close-up of the LabSen 843 hemispherical HA glass bulb and ceramic junction\" width=\"850\" height=\"850\" 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;\"\u003eActual LabSen 843 sensing end: the blue-filled hemispherical HA glass bulb and the ceramic junction just above it. Keep both immersed during measurement.\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\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;\"\u003eRefill with 3M KCl.\u003cbr\u003eStore the glass wet.\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;\"\u003eWhen the electrode is not in use, keep it in the storage bottle with 3M KCl soaking solution (Apera AI1107). Replace the solution if it becomes contaminated. Distilled and deionized water are rinse liquids, not storage liquids; never store the 843 in pure water.\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 reference solution runs down with use. When it falls to about half the electrode height, unplug the blue rubber plug and add 3M KCl through the refill hole with a syringe or pipette. After measuring, return the electrode to its bottle, tighten the cap and close the refill hole.\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;\"\u003eKeep the BNC and RCA connectors clean and dry. Apera puts typical pH-electrode service life at 12–24 months and recommends replacement every 12–18 months; frequent strong-alkali work sits at the demanding end of that range. The replacement electrode is LabSen 843, AI3179.\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-storage-refill-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-storage-refill-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-storage-refill-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-storage-refill-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"LabSen 843 manual storage and refilling instructions\" width=\"1380\" height=\"493\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:560px;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;\"\u003eLabSen 843 manual: store in 3M KCl (AI1107), never in pure water, and refill with 3M KCl at half height.\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-cleaning-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-cleaning-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-cleaning-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-cleaning-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"LabSen 843 manual rinsing and cleaning instructions\" width=\"1380\" height=\"328\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:760px;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;\"\u003eFor tough contamination, the manual specifies Apera cleaning solution AI1166 for 30 minutes, a soft brush, then at least one hour in 3M KCl before rinsing and recalibrating. Cleaning solution is sold separately.\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;\"\u003eA closer look at the LabSen 843 design.\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: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;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-silver-ion-trap-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-silver-ion-trap-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-silver-ion-trap-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-silver-ion-trap-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Apera silver ion trap reference system graphic showing AgCl element and silver-ion-trap beads\" width=\"1000\" height=\"1000\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:520px;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;\"\u003eApera graphic: the silver ion trap absorbs exuded Ag⁺ so it does not clog the junction.\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\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-labsen843-membrane-strength-20261017-mfr.webp?width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-membrane-strength-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-membrane-strength-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-membrane-strength-20261017-mfr.webp?width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"Apera graphic comparing sturdy glass membrane strength with conventional membranes\" width=\"1000\" height=\"1000\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:520px;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;\"\u003eApera graphic: Apera rates the 843’s sturdy glass membrane ten times stronger than traditional glass membranes. It is still glass; avoid impact.\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\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;margin:0;min-width:0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-lcd-20261015-8500.webp?v=1792098186\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-lcd-20261015-8500.webp?v=1792098186\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-lcd-20261015-8500.webp?v=1792098186\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-lcd-20261015-8500.webp?v=1792098186\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"PH8500 large LCD with stability icon, calibration icons, temperature, time and memory number\" width=\"1600\" height=\"1600\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:520px;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;\"\u003eShared PH8500 display: stability icon, calibration icons, temperature, time and stored-reading number. Screen values are illustrative.\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;\"\u003eRead the meter.\u003cbr\u003eKnow what is held.\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 standalone measurement and calibration. The stable-reading indicator and HOLD help you read a result; a held display is not a stored record.\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 PH8500 measures −2.00 to 16.00 pH at 0.01 or 0.1 pH resolution with ±0.01 pH ±1 digit accuracy, mV from −1999 to 1999, and temperature from −5 to 100°C. A calibration reminder can be set in days or hours. The meter runs on three AA batteries or 5 V USB power and carries an IP57 rating.\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;\"\u003eBuild a local record.\u003cbr\u003eKeep the transfer workflow clear.\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 PH8500 can retain up to 500 data sets, including number, date, time, measured value, unit and temperature. M+ saves a reading manually after stability, and timed logging records automatically at the interval you set. Deleting stored data cannot be undone.\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 computer work, connect the supplied USB cable and use PC-Link or the browser-based Web PC-Link on a desktop Chrome or Edge browser under Windows or Mac to download records and export them. While connected to PC-Link, new readings go to the software rather than to meter memory, so export before closing the session.\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-ph8500-usb-workflow-20261015-8500.webp?v=1792098186\u0026amp;width=1000\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-usb-workflow-20261015-8500.webp?v=1792098186\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-usb-workflow-20261015-8500.webp?v=1792098186\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-usb-workflow-20261015-8500.webp?v=1792098186\u0026amp;width=1000 1000w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"PH8500 connected to a computer through its USB cable\" width=\"1600\" height=\"1600\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:560px;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;\"\u003eShared PH8500 USB workflow in a manufacturer photograph. The computer is a prop, not included.\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\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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-specs-20261017-mfr.webp?width=926\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-specs-20261017-mfr.webp?width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-specs-20261017-mfr.webp?width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-labsen843-manual-specs-20261017-mfr.webp?width=926 926w\" sizes=\"(max-width:600px) calc(100vw - 80px), 560px\" alt=\"LabSen 843 manual technical specifications table\" width=\"926\" height=\"926\" 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;\"\u003eLabSen 843 manual specification table. Apera’s kit page lists 0–100°C for the electrode in this kit, matching the meter’s compensation range.\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;\"\u003eCheck the electrode limits.\u003cbr\u003eThen the meter’s.\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;\"\u003eApera lists the LabSen 843 in this kit at 2–14 pH and 0–100°C, with an HA hemispherical membrane, ceramic junction, silver-ion-trap reference, 3M KCl electrolyte, 30 kΩ NTC temperature sensor, lead-free glass body (Ø12 × 120 mm), membrane resistance below 500 MΩ, a 1 m cable and BNC plus RCA connectors.\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 meter’s automatic temperature compensation covers 0–100°C. Keep samples, buffers and the electrode within those limits, and confirm suitability with Apera’s documentation before measuring unusual chemistries.\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\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;\"\u003eCompare the Value configuration.\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 configuration: \u003ca href=\"\/products\/apera-ph850-sa-value-portable-strong-alkali-high-salinity-ph-meter-kit\" style=\"color:#245B45;text-decoration:underline;font-weight:600;\"\u003eApera PH850-SA Value Series Kit with LabSen 843 (AI5527)\u003c\/a\u003e. It supplies the same electrode with the PH850 meter, which reads 0.00 to 14.00 pH and has no data memory, clock or USB export. Choose the PH8500-SA when stored, time-stamped records matter.\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-ph8500-sa-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;\"\u003ePH8500-SA 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 electrode comes with PH8500-SA?\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 Swiss LabSen 843 refillable pH\/temperature electrode, replacement SKU AI3179. It has an HA-type glass membrane, ceramic junction, silver-ion-trap reference, 3M KCl electrolyte and built-in 30 kΩ NTC temperature sensor.\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 pH and temperature range does the electrode cover?\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;\"\u003eApera lists 2–14 pH and 0–100°C for the LabSen 843 in this kit, and designs it for strong alkaline solutions from pH 10 to 14. The meter’s wider −2.00 to 16.00 pH display range does not extend the electrode’s limits.\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;\"\u003eWhy does a strong-alkali sample need a special electrode?\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;\"\u003eAt high pH and high sodium concentration, general-purpose pH glass responds partly to sodium ions and reads lower than the true pH. The 843’s HA-type membrane is formulated to minimize that alkaline error.\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;\"\u003eWhich buffers should I use?\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;\"\u003eStart at pH 7.00, then use 10.01 pH, or 12.45 pH for samples near the top of the range. The kit includes pH 4.00, 7.00 and 10.01 buffers; pH 12.45 buffer is sold separately.\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 electrode refillable, and how do I store it?\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;\"\u003eYes. Refill the reference with 3M KCl (AI1107) when it falls to about half height, and store the electrode in its bottle with 3M KCl. Never store it in distilled or deionized water.\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;\"\u003eCan I use it in strong acids?\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;\"\u003eApera’s manual says the 843 should avoid strong acids and dehydrating media such as absolute ethanol and concentrated sulfuric acid. For strong acids and fluoride-containing samples, use the PH8500-HF with LabSen 833.\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 many readings can I save, and how do I export them?\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 data sets with number, date, time, value, unit and temperature, saved manually or at a timed interval. Export over the supplied USB cable with PC-Link or Web PC-Link.\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;\"\u003eApera provides a limited warranty of three years on the meter and six months on the electrode from delivery, excluding wear, misuse and the other causes listed in Apera’s terms. Warranty service is handled through Apera; returns are coordinated with Blue Tiger Scientific.\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 PH8500-SA AI5523 against the sample chemistry, supplied LabSen 843 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":52981749449002,"sku":"BTS-AI5523","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-ph8500-sa-hero-20261017-harsh.webp?v=1792215984","url":"https:\/\/bluetigerscientific.com\/products\/apera-ph8500-sa-portable-strong-alkali-high-salinity-ph-meter-kit","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}