{"product_id":"apera-do500-polarographic-do-replacement-probe","title":"Apera DO500 Polarographic Dissolved Oxygen Electrode | AI4110","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-do500-description\"\u003e\n\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(20px,4vw,42px);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 \/ DO500 \/ AI4110\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;\"\u003ePolarographic DO measurement with serviceable membrane caps\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 Apera DO500 is a replacement polarographic dissolved oxygen electrode for specified Apera meters, including SX716, SX725, SX736 and SX751. Integrated temperature and salinity sensors support automatic compensation, while replaceable membrane caps and inner solution provide a documented maintenance path.\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-do500-do500-kit-source.webp?v=1792336593\" alt=\"Apera DO500 electrode with calibration sleeve and three spare membrane caps\" width=\"3886\" height=\"3886\" loading=\"lazy\" style=\"display:block;width:100%;max-width:340px;height:auto;object-fit:contain;margin:0 auto;box-sizing:border-box;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.85rem;line-height:1.55;color:#5D6C63;text-align:center;margin-top:12px;\"\u003eManufacturer photograph of the DO500 electrode, sleeve and spare caps. See the contents list for the complete supplied items.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdetails id=\"bts-do500-guide\" style=\"border:1px solid #FF931A;border-radius:10px;margin-top:28px;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;box-sizing:border-box;font-size:1rem;font-weight:600;padding:18px;background:#FF931A;cursor:pointer;border-radius:9px;\"\u003eWhich system is this replacement for?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:18px;\"\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;\"\u003eCURRENT ITEM: DO500\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;\"\u003eThese are selected compatible meter-system or related-workflow pages, not additional items supplied with this accessory. Match the exact probe or component in the compatibility table below.\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 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:block;flex:1 1 220px;min-width:0;padding:20px;border:1px solid #B7D0BF;border-radius:8px;color:#26332C;text-decoration:none;background:white;\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-sx716-portable-polarographic-dissolved-oxygen-meter-kit\" data-meter=\"SX716\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-sx716-hero-20261016-sx700-eight.webp?v=1792171716\" alt=\"Apera SX716 Portable Dissolved Oxygen Meter Kit with DO500 Polarographic Probe\" loading=\"eager\" style=\"display:block;width:100%;max-width:105px;height:105px;object-fit:contain;margin:0 auto 14px;\"\u003e\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.05rem;font-weight:600;line-height:1.2;color:#245B45;margin:0 0 10px;\"\u003eSX716\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;\"\u003eCompatible DO500 meter\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-weight:600;text-decoration:underline;color:#245B45;\"\u003eView meter configuration\u003c\/span\u003e\u003c\/a\u003e\u003ca style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:block;flex:1 1 220px;min-width:0;padding:20px;border:1px solid #B7D0BF;border-radius:8px;color:#26332C;text-decoration:none;background:white;\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-sx725-portable-ph-dissolved-oxygen-meter-kit\" data-meter=\"SX725\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-sx725-hero-20261016-sx700-eight.webp?v=1792171716\" alt=\"Apera SX725 Portable pH and Dissolved Oxygen Meter Kit with DO500 Polarographic Probe\" loading=\"eager\" style=\"display:block;width:100%;max-width:105px;height:105px;object-fit:contain;margin:0 auto 14px;\"\u003e\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.05rem;font-weight:600;line-height:1.2;color:#245B45;margin:0 0 10px;\"\u003eSX725\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;\"\u003eCompatible DO500 meter\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-weight:600;text-decoration:underline;color:#245B45;\"\u003eView meter configuration\u003c\/span\u003e\u003c\/a\u003e\u003ca style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:block;flex:1 1 220px;min-width:0;padding:20px;border:1px solid #B7D0BF;border-radius:8px;color:#26332C;text-decoration:none;background:white;\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-sx736-portable-ph-conductivity-dissolved-oxygen-meter-kit\" data-meter=\"SX736\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-sx736-hero-20261016-sx700-eight.webp?v=1792171716\" alt=\"Apera SX736 Portable pH\/Conductivity\/DO Meter Kit\" loading=\"eager\" style=\"display:block;width:100%;max-width:105px;height:105px;object-fit:contain;margin:0 auto 14px;\"\u003e\u003ch3 style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:1.05rem;font-weight:600;line-height:1.2;color:#245B45;margin:0 0 10px;\"\u003eSX736\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;\"\u003eCompatible DO500 meter\u003c\/p\u003e\n\u003cspan style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-weight:600;text-decoration:underline;color:#245B45;\"\u003eView meter configuration\u003c\/span\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;\"\u003eWhy choose this replacement?\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;\"\u003eIntegrated compensation\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;\"\u003eTemperature compensation covers 0 to 45°C; automatic salinity compensation covers 0 to 45 ppt.\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;\"\u003eDocumented response\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 manufacturer specifies 90% response within 30 seconds at 25°C, with DO accuracy of ±0.30 mg\/L.\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;\"\u003eReplaceable membrane system\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 DO503 membrane cap and DO502 inner solution are replaceable maintenance items. The included DO504 papers are for cleaning a contaminated gold cathode as instructed.\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;\"\u003eCalibration sleeve included\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 supplied sleeve supports the saturated-air calibration procedure described in the SX716 manual.\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;\"\u003eCheck the exact probe and meter system.\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:100%;min-width:0;\"\u003e\u003ctable style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;table-layout:fixed;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eModel or component\u003c\/th\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eCompatibility and role\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX716\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX725\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX736\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX751\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX726\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX816\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eSX836\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCompatible meter. Explicitly named on the DO500 manufacturer product page. An 8-pin connector alone does not establish compatibility.\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:1rem;line-height:1.75;margin:0 0 16px;\"\u003eOptical sensor caps and polarographic membrane components are different replacement systems. A shared brand or similar appearance does not establish interchangeability.\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\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;\"\u003ePolarize, calibrate, then measure\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;\"\u003eFor SX716 operation, connect the electrode to the powered-on meter and allow five minutes of polarization before calibration or measurement. After replacing the membrane cap or adding new inner solution, the manual requires 30 minutes of polarization instead.\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 saturated-air calibration, keep the sleeve sponge moist with a few drops of distilled water, without dripping. Follow section 4.2 of the SX716 manual, including its stabilization instructions. Use the applicable meter manual for other compatible meters.\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-do500-do500-sensor-detail-source.webp?v=1792336593\" alt=\"DO500 diagram identifying temperature and salinity sensors, silver anode, gold cathode and replaceable membrane cap\" width=\"2000\" height=\"2000\" loading=\"lazy\" style=\"display:block;width:100%;max-width:420px;height:auto;object-fit:contain;margin:0 auto;box-sizing:border-box;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.85rem;line-height:1.55;color:#5D6C63;text-align:center;margin-top:12px;\"\u003eManufacturer illustration of the DO500 sensor and membrane assembly.\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 sensing system to the work.\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;\"\u003eGeneral water solutions\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 manufacturer specifies general water solutions as suitable samples. Strong acidic or alkaline water solutions and organic solutions are not suitable.\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;\"\u003eCompatible-meter replacement\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;\"\u003eUse as a replacement electrode for the listed Apera DO-capable meter models, rather than selecting on connector appearance alone.\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;\"\u003eWhat this order supplies\u003c\/h2\u003e\n\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:100%;min-width:0;\"\u003e\u003ctable style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;table-layout:fixed;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eIncluded item\u003c\/th\u003e\n\u003cth style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;text-align:left;background:#F1F7F3;font-weight:600;border:1px solid #B7D0BF;overflow-wrap:anywhere;\"\u003eOrder contents\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO500 electrode\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003e1 electrode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO502 inner solution\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003e1 refill, 30 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO503 membrane caps\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003e3 caps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eDO504 cathode polishing paper\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003e2 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eCalibration sleeve\u003c\/td\u003e\n\u003ctd style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:12px;border:1px solid #B7D0BF;vertical-align:top;overflow-wrap:anywhere;\"\u003eIncluded according to the manufacturer feature list\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\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\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-do500-do500-electrode-source.webp?v=1792336593\" alt=\"Apera DO500 polarographic electrode close-up\" width=\"2500\" height=\"2500\" loading=\"lazy\" style=\"display:block;width:100%;max-width:440px;height:auto;object-fit:contain;margin:0 auto;box-sizing:border-box;\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.85rem;line-height:1.55;color:#5D6C63;text-align:center;margin-top:12px;\"\u003eManufacturer close-up of the DO500 electrode.\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;\"\u003eMaintain the membrane and inner solution\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;\"\u003eInspect the membrane for wrinkles, cracks or damage and check the inner solution for air bubbles. The SX716 manual identifies slower response or obvious measurement errors as reasons to inspect and replace the membrane cap.\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;\"\u003eUse fresh DO502 solution with the DO503 replacement cap. Avoid touching the sensitive membrane with your fingers. Follow the manual for cleaning, assembly, polarization and calibration before returning to measurement.\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:30px 0;line-height:1.2;\" id=\"bts-do500-faq\"\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;\"\u003eDO500 buyer questions\u003c\/h2\u003e\n\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhich meters are listed for DO500?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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 SX716, SX725, SX726, SX736, SX751, SX816 and SX836. Confirm the exact meter model before ordering.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eDoes an 8-pin connector mean universal compatibility?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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;\"\u003eNo. DO500 has an 8-pin connector, but compatibility here is limited to the models explicitly listed by Apera.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhat comes with the electrode?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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 official contents list specifies one DO500 electrode, one 30 mL DO502 refill, three DO503 caps and two DO504 polishing papers. The feature list also confirms a calibration sleeve.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eHow long does polarization take?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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 SX716 manual specifies five minutes after power-on, or 30 minutes after a new membrane cap or new inner solution is installed.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eAre temperature and salinity sensors integrated?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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;\"\u003eYes. The DO500 manufacturer page specifies integrated temperature and salinity sensors with automatic compensation.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhat water samples is it suitable for?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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 general water solutions, excluding strong acidic or alkaline water solutions and organic solutions.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eWhich replacement consumables should I use?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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;\"\u003eDO502 is the specified inner solution and DO503 is the specified membrane cap. DO504 polishing paper is identified for gold-cathode cleaning.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #B7D0BF;border-radius:8px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"font-family:Open Sans,sans-serif;font-weight:600;box-sizing:border-box;font-size:1rem;line-height:1.2;padding:16px;cursor:pointer;\"\u003eIs the linked manual a standalone DO500 manual?\u003c\/summary\u003e\u003cdiv style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:0 16px 4px;\"\u003e\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;\"\u003eNo. It is the SX716 meter manual and includes DO electrode preparation, maintenance and replacement-part information.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Apera Instruments","offers":[{"title":"Default Title","offer_id":53007233122602,"sku":"BTS-AI4110","price":260.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-do500-do500-kit-source.webp?v=1792336593","url":"https:\/\/bluetigerscientific.com\/products\/apera-do500-polarographic-do-replacement-probe","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}