{"product_id":"apera-t500-5-ai4209","title":"Apera T500-5 Replacement Tungsten Lamp for TN500\/TN420 (AI4209)","description":"\u003cdiv class=\"bts-r-page\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;width:100%;max-width:1400px;margin:0 auto;line-height:1.75;color:#26332C;\"\u003e\n\u003cstyle\u003e.bts-r-page,.bts-r-page *{box-sizing:border-box}.bts-r-page img{max-width:100%;height:auto}.bts-r-selector\u003esummary{list-style:none}.bts-r-selector\u003esummary::-webkit-details-marker{display:none}.bts-r-selector .bts-r-open{display:none}.bts-r-selector[open] .bts-r-open{display:block}.bts-r-selector[open] .bts-r-closed{display:none!important}.bts-r-toggle:before{content:'+'}.bts-r-selector[open] .bts-r-toggle:before{content:'−'}.bts-r-model-card:hover{border-color:#FF931A!important;box-shadow:0 4px 14px rgba(23,43,77,.12)}.bts-r-page a:focus-visible,.bts-r-page summary:focus-visible{outline:3px solid #245B45;outline-offset:4px}.bts-r-page summary{min-height:48px}.bts-r-page table{max-width:100%}.bts-r-page th,.bts-r-page td{overflow-wrap:anywhere}@media(max-width:600px){.bts-r-page{font-size:16px!important}.bts-r-selector-inner{padding:16px!important}.bts-r-model-card{padding:14px!important;gap:12px!important}.bts-r-model-card\u003eimg{width:72px!important;height:72px!important;flex-basis:72px!important}.bts-r-page th,.bts-r-page td{padding:10px!important}}@media(prefers-reduced-motion:reduce){.bts-r-page *{scroll-behavior:auto!important;transition:none!important}}\u003c\/style\u003e\n\u003csection style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;padding:clamp(20px,4vw,48px);background:#F1F7F3;border:1px solid #B7D0BF;border-radius:14px;\"\u003e\u003cdiv style=\"display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"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:1rem;line-height:1.75;margin:0 0 16px;\"\u003e\u003cspan style=\"font-size:.8rem;letter-spacing:.12em;font-weight:600;\"\u003eAPERA INSTRUMENTS \/ T500-5 \/ AI4209\u003c\/span\u003e\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;\"\u003eReplace the light source.\u003cbr\u003eKeep the right optical system.\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;\"\u003eT500-5 is Apera’s replacement tungsten-filament lamp for TN500 and TN420 white-light turbidity meters. Match the host model before ordering and follow the meter procedure when replacing and checking the light source.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 320px;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\u003ca aria-label=\"View larger: Manufacturer T500-5 product reference.\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Manufacturer T500-5 product reference.\" decoding=\"async\" height=\"1600\" loading=\"lazy\" sizes=\"(max-width:600px) calc(100vw - 48px), 680px\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209\u0026amp;width=360 360w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209\u0026amp;width=640 640w, https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209\u0026amp;width=1000 1000w\" style=\"display:block;width:100%;max-width:520px;height:auto;object-fit:contain;margin:0 auto;\" width=\"1600\"\u003e\u003c\/a\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;font-size:.86rem;line-height:1.65;color:#5D6C63;margin-top:12px;\"\u003eManufacturer T500-5 product reference. Tap or click the image for a larger view.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdetails class=\"bts-r-selector\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;border:1px solid #FF931A;border-radius:10px;padding:0;margin:24px 0;background:#fff;\"\u003e\u003csummary style=\"display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px;background:#FF931A;color:#172b4d;cursor:pointer;border-radius:9px;font-weight:600;line-height:1.5;\"\u003e\u003cspan style=\"display:block;flex:1;min-width:0;\"\u003e\u003cspan style=\"display:block;font-size:clamp(17px,2.6vw,21px);font-weight:700;line-height:1.35;\"\u003eChoose the right accessory and host meter\u003c\/span\u003e\u003cspan class=\"bts-r-closed\" style=\"display:block;font-size:.88rem;font-weight:400;line-height:1.55;margin-top:5px;\"\u003eClick or tap to compare your options\u003c\/span\u003e\u003cspan class=\"bts-r-open\" style=\"font-size:.88rem;font-weight:400;line-height:1.55;margin-top:5px;\"\u003eCompare below — click or tap here to close\u003c\/span\u003e\u003c\/span\u003e\u003cspan aria-hidden=\"true\" class=\"bts-r-toggle\" style=\"display:flex;align-items:center;justify-content:center;flex:0 0 38px;width:38px;height:38px;border:1px solid rgba(23,43,77,.35);border-radius:50%;background:#fff;font-size:27px;font-weight:400;line-height:1;\"\u003e\u003c\/span\u003e\u003c\/summary\u003e\u003cdiv class=\"bts-r-selector-inner\" style=\"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;\"\u003eCompare the selected product with the related listings below. Check the application, connection and order contents before choosing.\u003c\/p\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:16px;\"\u003e\n\n\u003ca class=\"bts-r-model-card\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-instruments-tn500-portable-white-light-turbidity-meter-with-glp-data-logger-epa-180-1-compliant\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;gap:16px;align-items:center;flex:1 1 270px;min-width:0;padding:18px;border:1px solid #DCE6DF;border-radius:10px;background:#fff;color:#26332C;text-decoration:none;\"\u003e\n\u003cimg alt=\"Apera TN500 Portable White-Light Turbidity Meter with Data Logging Portable Turbidity Meter Apera Instruments\" height=\"90\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/tn500__1.webp?v=1745362533\u0026amp;width=180\" style=\"width:90px;height:90px;object-fit:contain;flex:0 0 90px;\" width=\"90\"\u003e\u003cspan style=\"display:block;min-width:0;\"\u003e\u003cstrong style=\"display:block;color:#245B45;font-size:1.08rem;line-height:1.4;\"\u003eApera TN500 Portable White-Light Turbidity Meter with Data Logging\u003c\/strong\u003e\u003cspan style=\"display:block;font-size:.9rem;line-height:1.6;margin-top:5px;\"\u003ePortable white-light turbidity meter with GLP data logging; review the exact accessory requirements.\u003c\/span\u003e\u003cspan style=\"display:inline-block;margin-top:10px;color:#245B45;font-weight:600;font-size:.88rem;\"\u003eView product →\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/a\u003e\u003ca class=\"bts-r-model-card\" href=\"https:\/\/bluetigerscientific.com\/products\/apera-instruments-tn420-portable-white-light-turbidity-meter-epa-180-1-compliant\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;box-sizing:border-box;display:flex;gap:16px;align-items:center;flex:1 1 270px;min-width:0;padding:18px;border:1px solid #DCE6DF;border-radius:10px;background:#fff;color:#26332C;text-decoration:none;\"\u003e\n\u003cimg alt=\"Apera TN420 Portable White-Light Turbidity Meter Portable Turbidity Meter Apera Instruments\" height=\"90\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/tn420_1.webp?v=1745615864\u0026amp;width=180\" style=\"width:90px;height:90px;object-fit:contain;flex:0 0 90px;\" width=\"90\"\u003e\u003cspan style=\"display:block;min-width:0;\"\u003e\u003cstrong style=\"display:block;color:#245B45;font-size:1.08rem;line-height:1.4;\"\u003eApera TN420 Portable White-Light Turbidity Meter\u003c\/strong\u003e\u003cspan style=\"display:block;font-size:.9rem;line-height:1.6;margin-top:5px;\"\u003ePortable white-light turbidity meter alternative; confirm accessory compatibility before ordering.\u003c\/span\u003e\u003cspan style=\"display:inline-block;margin-top:10px;color:#245B45;font-weight:600;font-size:.88rem;\"\u003eView product →\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/a\u003e\n\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;\"\u003eLinked cards open current store listings. Other cards compare configurations; they do not imply current storefront availability.\u003c\/p\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\u003cdiv style=\"display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\n\u003cdiv style=\"flex:1 1 100%;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;\"\u003eMatch the exact\u003cbr\u003eTN500 or TN420 part.\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;\"\u003eTN500 and TN420 use the tungsten white-light system identified for this lamp. This is not a universal infrared LED replacement for every Apera turbidimeter.\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;\"\u003eOlder catalogs use TN500-S naming; Apera’s current accessory page identifies this model as T500-5. The manufacturer AI part number remains AI4209.\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=\"display:flex;flex-wrap:wrap;align-items:center;gap:clamp(24px,4vw,48px);\"\u003e\n\u003cdiv style=\"flex:1 1 100%;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;\"\u003eReplace, check\u003cbr\u003eand return to service.\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;\"\u003eTurn off the meter and follow its lamp-replacement instructions. Handle the replacement carefully and complete the checks or calibration required by the host procedure before reporting sample results.\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 accessory page does not provide additional wattage or lamp-life specifications. Use the exact replacement model rather than assuming generic specifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\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 includes.\u003c\/h2\u003e\n\u003cdiv aria-label=\"Order detail 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=\"background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eOrder detail\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eConfiguration\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eProduct\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eT500-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eManufacturer part number\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eAI4209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eBlue Tiger SKU\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eBTS-AI4209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eOrder contents\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eOne tungsten-filament lamp for TN500 \/ TN420. Meter and other accessories are separate.\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\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 fit\u003cbr\u003ebefore ordering.\u003c\/h2\u003e\n\u003cdiv aria-label=\"Specification 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=\"background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eSpecification\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"background:#f5f5f5;text-align:left;padding:12px;font-size:1rem;font-weight:700;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eAccessory model\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eT500-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eManufacturer PN\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eAI4209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eCompatible hosts\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eApera TN500 \/ TN420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9f9f9;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eType\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eTungsten-filament lamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"padding:12px;text-align:left;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;font-weight:600;overflow-wrap:anywhere;\"\u003eOrder unit\u003c\/th\u003e\n\u003ctd style=\"padding:12px;font-size:1rem;line-height:1.6;vertical-align:top;border:1px solid #e0e0e0;width:50%;overflow-wrap:anywhere;\"\u003eOne replacement part\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;\"\u003eMatch the stated limits and configuration to your procedure. The Product Specifications tab repeats the order details for quick reference.\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\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 related products.\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;\"\u003e\u003ca href=\"https:\/\/bluetigerscientific.com\/products\/apera-instruments-tn500-portable-white-light-turbidity-meter-with-glp-data-logger-epa-180-1-compliant\" style=\"color:#245B45;font-weight:600;text-decoration:underline;\"\u003eApera TN500 Portable White-Light Turbidity Meter with Data Logging\u003c\/a\u003e\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;\"\u003e\u003ca href=\"https:\/\/bluetigerscientific.com\/products\/apera-instruments-tn420-portable-white-light-turbidity-meter-epa-180-1-compliant\" style=\"color:#245B45;font-weight:600;text-decoration:underline;\"\u003eApera TN420 Portable White-Light Turbidity Meter\u003c\/a\u003e\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\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;\"\u003eT500-5 buyer questions\u003c\/h2\u003e\n\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eWhich meters use this part?\u003c\/summary\u003e\u003cdiv style=\"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 identifies T500-5 for TN500 and TN420 turbidity meters.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eWhat is the manufacturer part number?\u003c\/summary\u003e\u003cdiv style=\"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;\"\u003eAI4209; the older workbook name is TN500-S5.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eIs a meter included?\u003c\/summary\u003e\u003cdiv style=\"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. This is a replacement accessory for an existing compatible instrument.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eCan I use a generic replacement?\u003c\/summary\u003e\u003cdiv style=\"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;\"\u003eUse the specified part. Appearance alone does not establish electrical, mechanical or optical compatibility.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eWhat should I do before installation?\u003c\/summary\u003e\u003cdiv style=\"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;\"\u003ePower down the meter, disconnect external power and follow the host manual’s replacement procedure.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eDoes it fit every Apera turbidity meter?\u003c\/summary\u003e\u003cdiv style=\"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 universal compatibility is claimed. Confirm TN500 or TN420 and the correct replacement model.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eIs this an infrared LED?\u003c\/summary\u003e\u003cdiv style=\"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. This is the tungsten-filament lamp for the specified white-light turbidimeters.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"bts-r-faq\" style=\"border:1px solid #DCE6DF;border-radius:7px;margin:0 0 10px;background:#fff;\"\u003e\u003csummary style=\"padding:16px;font-weight:600;line-height:1.4;cursor:pointer;\"\u003eWhat should I check after replacement?\u003c\/summary\u003e\u003cdiv style=\"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;\"\u003eFollow the host manual’s startup checks and any calibration or functional checks required before taking reportable measurements.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003c\/section\u003e\u003csection style=\"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;\"\u003eChoose the configuration\u003cbr\u003ethat fits your work.\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 the order contents and the required host meter and application before ordering. Contact Blue Tiger Scientific if you need help matching the part.\u003c\/p\u003e\n\u003ca href=\"#\" style=\"color:#245B45;font-weight:600;text-decoration:underline;\"\u003eBack to price and ordering ↑\u003c\/a\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Apera Instruments","offers":[{"title":"Default Title","offer_id":53027567239466,"sku":"BTS-AI4209","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/apera-next-mfr-13-20261019.webp?v=1792433209","url":"https:\/\/bluetigerscientific.com\/products\/apera-t500-5-ai4209","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}