{"product_id":"hanna-hi764-25-marine-nitrite-ulr-reagents","title":"Hanna HI764-25 Marine Nitrite ULR Reagents — 25 Tests","description":"\u003cdiv id=\"bts-hi764-25-description\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;max-width:1400px;margin:0 auto;background:#fff;color:#444;padding:20px;\"\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eKeep ultra-low marine nitrite-nitrogen checks in your routine\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eMonitor trace nitrite-nitrogen in marine water with matched, premeasured reagent. HI764-25 provides 25 tests for the HI764 Checker and the documented Nitrite, Marine Ultra Low Range methods on HI83300, HI83303 and HI83399.\u003c\/p\u003e\n\u003cfigure style=\"margin:24px auto;max-width:520px;text-align:center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/nitrite-ultra-low-reagents-hi764-25__67004.1559321301.jpg?v=1793900864\" alt=\"Hanna HI764-25 matched reagent pack — manufacturer illustration\" style=\"width:100%;max-width:480px;height:auto;display:block;margin:auto;\" loading=\"lazy\"\u003e\u003cfigcaption style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-size:0.85rem;color:#666;margin-top:10px;\"\u003eManufacturer stock illustration. Pictured packet lot and expiry are historical and do not describe the stock supplied.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cdiv style=\"background:#F1F7F3;padding:20px;box-sizing:border-box;\"\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eChoose the refill that matches your method\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eChoose this refill when your marine monitoring calls for ultra-low nitrite-nitrogen measurements rather than a higher-range test. Premeasured packets remove bulk reagent preparation from the routine while keeping the chemistry matched to the supported method.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eKnow what your result represents\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eReport the base result as nitrite-nitrogen (NO2−-N), not the same numeric value as nitrite ion (NO2−). Follow the selected instrument’s reaction time: Checker timing must not be substituted for a benchtop procedure.\u003c\/p\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eWhat is included — and what to have ready\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eReagent for 25 nominal tests. One packet is used per measurement; the Checker and HI83303 instructions identify the reagent as HI764-0, while HI83300 and HI83399 list HI764-25 in the required-reagent table. Meter, cuvettes, caps and check standards are separate.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eHave a compatible meter, clean model-appropriate cuvette and cap, and the sample-handling accessories specified by that instrument. A lint-free cuvette cloth and cuvette cleaning solution are useful separate maintenance supplies; a model-specific check standard is optional and does not replace the analytical reagent. The stated capacity is 25 tests, not a bottle-volume or powder-mass specification.\u003c\/p\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eUse the procedure for your instrument\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eThe exact reagent set is listed for HI764 and for the marine method on HI83300, HI83303 and HI83399. Select the documented method, follow its blanking, addition and reaction steps, and keep cuvette exteriors clean. Do not transfer Checker timing or optical specifications to a benchtop instrument.\u003c\/p\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eHandling and documentation\u003c\/h4\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eRead the HI764-0 component Safety Data Sheet and the selected instrument method before use. Follow the instructions on the actual reagent supplied.\u003c\/p\u003e\n\u003cp style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;margin:0 0 16px;\"\u003eHanna classifies this exact refill as Dangerous Goods and states that it can only be shipped via ground.\u003c\/p\u003e\n\u003cdiv class=\"faq_block\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\" style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;line-height:1.15;border-top:1px solid #ddd;margin-top:30px;padding-top:20px;\"\u003e\n\u003ch4 style=\"font-family:'Open Sans',sans-serif;font-weight:300;font-size:1rem;line-height:1.65;box-sizing:border-box;font-weight:400;line-height:1.35;color:#245B45;margin:26px 0 14px;\"\u003eFrequently asked questions\u003c\/h4\u003e\n\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eWhen should I choose HI764-25?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eChoose this refill when your marine monitoring calls for ultra-low nitrite-nitrogen measurements rather than a higher-range test. Premeasured packets remove bulk reagent preparation from the routine while keeping the chemistry matched to the supported method.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eWhich instruments are supported?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eUse HI764 Checker or the explicitly documented marine method on HI83300, HI83303 or HI83399. The compatible-instrument cards below link existing benchtop pages; no general compatibility with all photometers is implied.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eIs 200 ppb nitrite-nitrogen also 200 ppb nitrite ion?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eNo. These ranges are reported as NO2−-N. Nitrite ion mass is 3.29 times the nitrogen-basis reading, so the numeric value changes when converted. Keep the reporting basis with every result; do not relabel a 0–200 NO2−-N range as 0–200 NO2−.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eHow many tests does one pack provide?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eThe nominal capacity is 25 tests using the specified method. This is a test-capacity statement, not a total reagent fill volume or powder weight. Repeat measurements consume reagent too.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eWhat comes with the refill, and what is separate?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eReagent for 25 nominal tests. One packet is used per measurement; the Checker and HI83303 instructions identify the reagent as HI764-0, while HI83300 and HI83399 list HI764-25 in the required-reagent table. Meter, cuvettes, caps and check standards are separate.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eCan I use the Checker instructions on a benchtop?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eUse the current procedure for the exact reader and selected method. Sample handling, blanking and reaction timing must follow that manual; shared reagent identity is not proof that every instrument setting is identical.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eWhat accessories help routine testing?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eUse clean cuvettes and caps specified for your instrument. A lint-free cloth and cuvette cleaning solution help maintain clear optical surfaces. Model-specific check standards are optional and are not reagent replacements; Checker cuvettes should not be assumed to fit a benchtop.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" style=\"border-bottom:1px solid #ddd;padding:14px 0;\"\u003e\u003csummary itemprop=\"name\" style=\"font-weight:400;cursor:pointer;color:#245B45;line-height:1.4;\"\u003eWhere are the safety instructions, and does the photo show my lot?\u003c\/summary\u003e\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cdiv itemprop=\"text\" style=\"font-weight:300;line-height:1.65;padding-top:12px;\"\u003eThe Manuals\/Brochures tab links the verified HI764-0 US component SDS and instrument method PDFs. Check the labels on the pack you receive; the manufacturer illustration does not establish the supplied lot, expiry or remaining shelf life. Hanna lists this refill as ground-shipping-only Dangerous Goods.\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":53468101902634,"sku":"BTS-HI764-25","price":20.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/nitrite-ultra-low-reagents-hi764-25__67004.1559321301.jpg?v=1793900864","url":"https:\/\/bluetigerscientific.com\/products\/hanna-hi764-25-marine-nitrite-ulr-reagents","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}