{"title":"Water Testing \u0026 Reagents","description":"Water testing equipment and reagents — testers, kits and refills to keep your parameters in check.","products":[{"product_id":"salinity-tester-hanna","title":"Hanna Instruments Marine Salinity Tester","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Salinity Tester\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Hanna Marine Salinity Tester is a digital instrument designed to provide fast, accurate salinity measurements for saltwater aquariums. Using a conductivity-based sensor, it eliminates the guesswork associated with traditional hydrometers and refractometers. Ideal for reef and marine hobbyists, it delivers precise readings in parts per thousand (ppt), specific gravity, or PSU, helping maintain stable water conditions essential for the health of corals, fish, and other marine life. Its waterproof design and simple calibration process make it a reliable tool for routine aquarium maintenance.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44253012852824,"sku":null,"price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/salinity-tester-hanna.jpg?v=1794159859"},{"product_id":"salinity-tester-icecap","title":"IceCap Salinity\/Temperature Digital Pocket Tester","description":"\u003cp\u003e\u003cspan\u003eIceCap Salinity\/Temperature Digital Pocket Tester\u003c\/span\u003e\u003cspan\u003e is a digital meter that delivers quick, accurate salinity and temperature readings for saltwater aquariums using conductivity technology.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCompact, pocket-sized digital display\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMeasures both salinity (specific gravity) and temperature in one device\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMore precise and repeatable than swing-arm hydrometers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIdeal for routine water-parameter checks in reef and marine aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IceCap","offers":[{"title":"Default Title","offer_id":44253014098008,"sku":null,"price":92.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/salinity-tester-icecap.jpg?v=1794159864"},{"product_id":"coralife-hydrometer","title":"Coralife Deep Six Hydrometer","description":"\u003cp\u003e\u003cspan\u003eCoralife Deep Six Hydrometer\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eCoralife Deep Six Hydrometer\u003c\/span\u003e\u003cspan\u003e is an easy-to-use tool for measuring the specific gravity and salinity of saltwater aquariums. Designed with a precision swing-arm mechanism, it provides quick readings to help hobbyists maintain proper water conditions for marine fish, corals, and invertebrates. The hydrometer features a wide measurement range and a clear, easy-to-read scale, making it a convenient and affordable option for routine salinity monitoring in reef and saltwater systems.\u003c\/span\u003e\u003c\/p\u003e","brand":"Coralife","offers":[{"title":"Default Title","offer_id":44253029466200,"sku":null,"price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/coralife-hydrometer.jpg?v=1794159874"},{"product_id":"nitrite-test-kit","title":"Nitrite Test Kit","description":"\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eAPI (Aquarium Pharmaceuticals) Nitrite Test Kit\u003c\/span\u003e\u003cspan\u003e is a liquid test kit used in both freshwater and saltwater aquariums to measure \u003c\/span\u003e\u003cspan\u003enitrite (NO₂⁻)\u003c\/span\u003e\u003cspan\u003e levels in the water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNitrite is one of the most important parameters to monitor during the nitrogen cycle because it’s \u003c\/span\u003e\u003cspan\u003etoxic to fish and invertebrates even at low levels\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhat it does\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMeasures nitrite concentration in aquarium water\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps track tank cycling progress\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIdentifies dangerous spikes during fish-in cycles or system crashes\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eRange \u0026amp; accuracy\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eTypically reads from \u003c\/span\u003e\u003cspan\u003e0 to ~5 ppm (mg\/L)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eColor chart-based comparison (pink\/purple scale)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for hobby-level but reliable reef\/freshwater monitoring\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"API","offers":[{"title":"Default Title","offer_id":44253062168664,"sku":null,"price":13.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/nitrite-test-kit.jpg?v=1794159911"},{"product_id":"ammonia","title":"Ammonia Test Kit","description":"\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eAPI Ammonia Test Kit\u003c\/span\u003e\u003cspan\u003e (by \u003c\/span\u003e\u003cspan\u003eAPI (Aquarium Pharmaceuticals Inc.)\u003c\/span\u003e\u003cspan\u003e) is one of the most commonly used freshwater and saltwater aquarium test kits for measuring \u003c\/span\u003e\u003cspan\u003eammonia (NH₃ \/ NH₄⁺)\u003c\/span\u003e\u003cspan\u003e levels in tank water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e🧪 What it tests\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt measures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eTotal ammonia (toxic + less toxic forms)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eRange: typically \u003c\/span\u003e\u003cspan\u003e0 – 8.0 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eAmmonia is the \u003c\/span\u003e\u003cspan\u003e#1 toxic compound\u003c\/span\u003e\u003cspan\u003e in new tanks and during fish\/coral stress events.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e📦 What’s included\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eLiquid reagent bottles (usually 2-part system)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTest vial\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eColor chart\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInstructions booklet\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"API","offers":[{"title":"Default Title","offer_id":44253063675992,"sku":null,"price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/ammonia.jpg?v=1794159917"},{"product_id":"hanna-marine-magnesium-handheld-colorimeter","title":"Hanna Instruments Marine Magnesium Checker (HI783)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Magnesium Checker (HI783)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Hanna Marine Magnesium Checker (HI783) is a digital colorimeter designed to accurately measure magnesium levels in saltwater aquariums. It eliminates the guesswork of traditional color-matching test kits by providing a fast, easy-to-read digital result, making it ideal for reef keepers who want consistent and reliable testing. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital magnesium testing for saltwater and reef aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e1,000–1,800 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e5 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eColor-coded syringes for simplified testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact, portable design with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps maintain proper magnesium levels, which support stable calcium and alkalinity for healthy coral growth.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44292823842904,"sku":null,"price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-marine-magnesium-handheld-colorimeter.jpg?v=1794160058"},{"product_id":"hanna-marine-calcium-handheld-colorimeter","title":"Hanna Instruments Marine Calcium Checker (HI758)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Calcium Checker (HI758)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Hanna Marine Calcium Checker (HI758) is a digital colorimeter that provides fast, accurate calcium measurements for saltwater aquariums. Designed as a more precise alternative to traditional color-matching test kits, it delivers easy-to-read digital results to help reef hobbyists maintain stable calcium levels essential for healthy coral growth and skeletal development. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital calcium testing for saltwater and reef aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e200–600 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e1 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAccuracy: \u003c\/span\u003e\u003cspan\u003e±6 ppm ±5% of reading\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact, portable handheld design\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps maintain proper calcium levels for healthy coral growth and overall reef stability. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44292831772760,"sku":null,"price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-marine-calcium-handheld-colorimeter.jpg?v=1794160064"},{"product_id":"hanna-marine-nitrate-handheld-colorimeter","title":"Hanna Instruments Marine Nitrate High Range Checker (HI782)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Nitrate High Range Checker (HI782)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Hanna Marine Nitrate High Range Checker (HI782) is a digital colorimeter that provides fast, accurate nitrate measurements for saltwater aquariums. It eliminates the guesswork of traditional color comparison tests by displaying a precise digital reading, making it an excellent choice for reef and fish-only marine systems. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital nitrate testing for saltwater aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e0.0–75.0 ppm (NO₃⁻)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e0.1 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAccuracy: \u003c\/span\u003e\u003cspan\u003e±2.0 ppm ±5% of reading\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUses the zinc reduction method for reliable results\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes starter reagents for \u003c\/span\u003e\u003cspan\u003e10 tests\u003c\/span\u003e\u003cspan\u003e (25-test refill reagents available)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps monitor nutrient levels to reduce unwanted algae growth and maintain a healthy reef environment. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44292834590808,"sku":null,"price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-marine-nitrate-handheld-colorimeter.jpg?v=1794160069"},{"product_id":"handheld-marine-alkalinity-colorimeter","title":"Hanna Instruments Marine Alkalinity Checker (HI772)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Alkalinity Checker (HI772)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Alkalinity Checker (HI772)\u003c\/span\u003e\u003cspan\u003e is a digital colorimeter that provides fast, accurate alkalinity measurements for saltwater aquariums. It eliminates the guesswork of traditional color-matching test kits by displaying a precise digital reading in \u003c\/span\u003e\u003cspan\u003edKH\u003c\/span\u003e\u003cspan\u003e, making it an essential tool for maintaining stable water chemistry and promoting healthy coral growth. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital alkalinity testing for saltwater and reef aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e0.0–20.0 dKH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e0.1 dKH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAccuracy: \u003c\/span\u003e\u003cspan\u003e±0.3 dKH ±5% of reading\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact, portable handheld design\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps maintain stable alkalinity to support coral growth, pH stability, and overall reef health.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44292840456280,"sku":null,"price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/handheld-marine-alkalinity-colorimeter.jpg?v=1794160074"},{"product_id":"hanna-handheld-phosphate-colorimeter","title":"Hanna Instruments Marine Phosphate ULR Checker (HI774)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Phosphate Ultra Low Range Checker (HI774)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Phosphate ULR Checker (HI774)\u003c\/span\u003e\u003cspan\u003e is a digital colorimeter designed to accurately measure ultra-low phosphate levels in saltwater aquariums. It provides fast, precise digital results without the guesswork of color-matching test kits, making it an essential tool for reef hobbyists looking to maintain optimal nutrient levels for healthy coral growth and vibrant coloration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital phosphate testing for saltwater and reef aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e0.00–0.90 ppm (PO₄³⁻)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e0.01 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAccuracy: \u003c\/span\u003e\u003cspan\u003e±0.02 ppm ±5% of reading\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact, handheld design for convenient testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIdeal for monitoring phosphate levels to help prevent nuisance algae while supporting a healthy, balanced reef aquarium.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44292855464024,"sku":null,"price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-handheld-phosphate-colorimeter.jpg?v=1794160081"},{"product_id":"hanna-reagent-phosphorus-ulr","title":"Hanna Instruments Phosphorus ULR Reagent Refill (HI736-25)","description":"\u003cp\u003e\u003cspan\u003eHanna Phosphorus ULR Reagents (HI736-25)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Phosphorus Ultra Low Range Reagents (HI736-25)\u003c\/span\u003e\u003cspan\u003e are replacement reagents designed for use with the \u003c\/span\u003e\u003cspan\u003eHanna HI736 Phosphorus ULR Checker\u003c\/span\u003e\u003cspan\u003e. Manufactured to Hanna’s high-quality standards, these pre-measured reagents provide accurate, reliable phosphorus testing and are ideal for maintaining consistent water quality in reef aquariums.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eDesigned exclusively for the \u003c\/span\u003e\u003cspan\u003eHanna HI736 Phosphorus ULR Checker\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes enough reagent for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePre-measured packets for quick and easy testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProvides consistent, accurate phosphorus measurements\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps monitor ultra-low nutrient levels to support healthy coral growth and reduce nuisance algae\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLong shelf life when stored in a cool, dry place\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eNote:\u003c\/span\u003e\u003cspan\u003e These reagents measure \u003c\/span\u003e\u003cspan\u003ephosphorus (ppb P)\u003c\/span\u003e\u003cspan\u003e, not phosphate (ppm PO₄). If needed, phosphorus readings can be converted to phosphate by multiplying the result by \u003c\/span\u003e\u003cspan\u003e0.003066\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293042307160,"sku":null,"price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-reagent-phosphorus-ulr.jpg?v=1794160085"},{"product_id":"hanna-reagent-alkalinity","title":"Hanna Instruments Marine Alkalinity Reagent Refill (HI772-26)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Alkalinity Reagents (HI772-26)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Alkalinity Reagents (HI772-26)\u003c\/span\u003e\u003cspan\u003e are replacement reagents designed specifically for use with the \u003c\/span\u003e\u003cspan\u003eHanna Marine Alkalinity Checker (HI772)\u003c\/span\u003e\u003cspan\u003e. These pre-measured, high-quality reagents provide fast, accurate, and consistent alkalinity testing, helping reef hobbyists maintain stable water chemistry for healthy coral growth and optimal aquarium performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eDesigned exclusively for the \u003c\/span\u003e\u003cspan\u003eHanna Marine Alkalinity Checker (HI772)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes enough reagent for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePre-measured for quick, easy, and consistent testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eUses a \u003c\/span\u003e\u003cspan\u003ecolorimetric method\u003c\/span\u003e\u003cspan\u003e for accurate digital alkalinity readings\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasures alkalinity in the \u003c\/span\u003e\u003cspan\u003e0.0–20.0 dKH\u003c\/span\u003e\u003cspan\u003e range\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eManufactured with high-purity chemicals for dependable results\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLot number and expiration date printed on each reagent bottle for traceability\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSupports stable alkalinity, helping promote coral growth, pH stability, and overall reef health. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293062230104,"sku":null,"price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/EC7CF684-9871-47B8-AD4F-D7AF918D7B4B.jpg?v=1782752157"},{"product_id":"hanna-reagent-magnesium","title":"Hanna Reagent Magnesium","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Magnesium Reagents (HI783-25)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Magnesium Reagents (HI783-25)\u003c\/span\u003e\u003cspan\u003e are replacement reagents designed specifically for use with the \u003c\/span\u003e\u003cspan\u003eHanna Marine Magnesium Checker (HI783)\u003c\/span\u003e\u003cspan\u003e. These pre-measured, high-quality reagents provide accurate and consistent magnesium testing, making it easy to maintain proper magnesium levels for a healthy and stable reef aquarium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eDesigned exclusively for the \u003c\/span\u003e\u003cspan\u003eHanna Marine Magnesium Checker (HI783)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes enough reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePre-measured for fast, simple, and reliable testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDelivers accurate, repeatable magnesium measurements\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eManufactured with high-purity chemicals for dependable results\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLot number and expiration date printed on each reagent for quality assurance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps maintain stable magnesium levels, supporting healthy coral growth, balanced calcium and alkalinity, and overall reef stability.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293078646872,"sku":null,"price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-reagent-magnesium.jpg?v=1794160096"},{"product_id":"hanna-reagent-marine-nitrate-low-range","title":"Hanna Instruments Marine Nitrate Low Range Checker (HI781)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Nitrate Low Range Checker (HI781-25)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Nitrate Low Range Checker (HI781-25)\u003c\/span\u003e\u003cspan\u003eis a digital colorimeter designed to accurately measure low nitrate levels in saltwater aquariums. It provides fast, precise digital readings without the guesswork of traditional color comparison tests, making it ideal for reef hobbyists maintaining ultra-low nutrient systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDigital nitrate testing for saltwater and reef aquariums\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurement range: \u003c\/span\u003e\u003cspan\u003e0.00–5.00 ppm (NO₃⁻)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eResolution: \u003c\/span\u003e\u003cspan\u003e0.01 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAccuracy: \u003c\/span\u003e\u003cspan\u003e±0.25 ppm ±2% of reading\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy-to-read LCD display with one-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact, handheld design for quick and convenient testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes starter reagents for \u003c\/span\u003e\u003cspan\u003e10 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps maintain optimal nitrate levels to support healthy coral coloration, growth, and overall reef stability while minimizing nuisance algae.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293088673880,"sku":null,"price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-reagent-marine-nitrate-low-range.jpg?v=1794160102"},{"product_id":"hanna-reagent-nitrate-high-range","title":"Hanna Instruments Marine Nitrate High Range Reagent Refill (HI782-25)","description":"\u003cp\u003e\u003cspan\u003eHanna Marine Nitrate High Range Reagents (HI782-25)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna Marine Nitrate High Range Reagents (HI782-25)\u003c\/span\u003e\u003cspan\u003e are replacement reagents designed specifically for use with the \u003c\/span\u003e\u003cspan\u003eHanna Marine Nitrate High Range Checker (HI782)\u003c\/span\u003e\u003cspan\u003e. These pre-measured, high-quality reagents provide accurate and reliable nitrate testing, making it easy to monitor nutrient levels and maintain a healthy marine aquarium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eDesigned exclusively for the \u003c\/span\u003e\u003cspan\u003eHanna Marine Nitrate High Range Checker (HI782)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIncludes enough reagents for \u003c\/span\u003e\u003cspan\u003e25 tests\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePre-measured for fast, simple, and consistent testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProvides accurate and repeatable nitrate measurements\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eManufactured with high-purity chemicals for dependable results\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLot number and expiration date printed on each reagent for quality assurance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps monitor nitrate levels to support fish health, reduce nuisance algae, and maintain stable water quality in saltwater and reef aquariums.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293098864728,"sku":null,"price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-reagent-nitrate-high-range.jpg?v=1794160107"},{"product_id":"hanna-phosphate-reagent-low-range","title":"Hanna Instruments Phosphate Low Range Reagent (HI713-0)","description":"\u003cp\u003e\u003cspan\u003eHanna Phosphate Low Range Reagent (HI713-0)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eHanna HI713-0 Phosphate Low Range Reagent\u003c\/span\u003e\u003cspan\u003e is the individual reagent packet used with the \u003c\/span\u003e\u003cspan\u003eHanna Phosphate Low Range Checker (HI713)\u003c\/span\u003e\u003cspan\u003e to measure phosphate levels in water. Each pre-measured packet is designed for a single test, providing accurate and consistent results with minimal preparation. It uses the \u003c\/span\u003e\u003cspan\u003eascorbic acid colorimetric method\u003c\/span\u003e\u003cspan\u003e, where the reagent reacts with phosphate to produce a blue color that is measured by the HI713 Checker. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFeatures:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eDesigned exclusively for the \u003c\/span\u003e\u003cspan\u003eHanna Phosphate Low Range Checker (HI713)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSingle-use, pre-measured reagent packet for accurate testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEasy to use with minimal sample preparation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eUses the \u003c\/span\u003e\u003cspan\u003eascorbic acid colorimetric method\u003c\/span\u003e\u003cspan\u003e for reliable phosphate measurement\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProduces consistent, repeatable results\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps monitor phosphate levels to reduce nuisance algae and maintain healthy water quality in freshwater and marine aquariums. \u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44293106008152,"sku":null,"price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/hanna-phosphate-reagent-low-range.jpg?v=1794160113"},{"product_id":"neptune-systems-trident-alk-cal-mag-water-tester","title":"Neptune Systems Trident (Alk, Cal, Mag) Automatic Water Tester","description":"Automated water testing that continuously monitors alkalinity, calcium, and magnesium in saltwater aquariums and communicates the data to your Apex controller.\n\nTests alkalinity, calcium \u0026amp; magnesium automatically\nIncludes 2-month reagent kit and calibration solution\nRequires a Neptune Systems Apex controller","brand":"Neptune Systems","offers":[{"title":"Default Title","offer_id":68150161145944,"sku":null,"price":699.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/trident.jpg?v=1794288355"},{"product_id":"neptune-systems-trident-np-nitrate-phosphate-tester","title":"Neptune Systems Trident NP Automatic Nitrate \u0026 Phosphate Water Tester (Without Reagents)","description":"Automated water testing that continuously monitors nitrate and phosphate in saltwater aquariums and communicates the data to your Apex controller.\n\nTests nitrate (NO3) \u0026amp; phosphate (PO4) automatically\nReagents and calibration solution sold separately\nRequires a Neptune Systems Apex controller","brand":"Neptune Systems","offers":[{"title":"Default Title","offer_id":68150161375320,"sku":null,"price":679.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/trident-np-unit.jpg?v=1794289530"},{"product_id":"neptune-systems-trident-reagent-kit-6-month-supply","title":"Neptune Systems Trident Reagent Kit - 6 Month Supply","description":"Replacement reagent kit for the Neptune Systems Trident automatic water tester, which tests alkalinity, calcium and magnesium. Six month supply at the default testing schedule: 6 bottles of Reagent A, 3 bottles of Reagent B, 3 bottles of Reagent C and calibration solution.","brand":"Neptune Systems","offers":[{"title":"Default Title","offer_id":68157426008152,"sku":null,"price":114.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/trident-reagent-6month.jpg?v=1794373418"},{"product_id":"neptune-systems-trident-reagent-kit-2-month-supply","title":"Neptune Systems Trident Reagent Kit - 2 Month Supply","description":"Replacement reagent kit for the Neptune Systems Trident automatic water tester, which tests alkalinity, calcium and magnesium. Two month supply at the default testing schedule: 2 bottles of Reagent A, 1 bottle of Reagent B, 1 bottle of Reagent C and calibration solution.","brand":"Neptune Systems","offers":[{"title":"Default Title","offer_id":68157426139224,"sku":null,"price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/trident-reagent-2month.jpg?v=1794373430"},{"product_id":"neptune-systems-trident-np-reagent-kit-2-month-supply","title":"Neptune Systems Trident NP Reagent Kit - 2 Month Supply","description":"Replacement reagent kit for the Neptune Systems Trident NP automatic water tester, which tests nitrates and phosphates. Two month supply at the default testing schedule: Reagent 1, Reagent 2, a Reagent 3 set, waste neutralizer and calibration solution.","brand":"Neptune Systems","offers":[{"title":"Default Title","offer_id":68157426630744,"sku":null,"price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0263\/6375\/6632\/files\/trident-np-reagent-2month.jpg?v=1794373444"}],"url":"https:\/\/www.strictlyfishmiami.com\/collections\/water-testing-reagents.oembed","provider":"Strictly Fish \u0026 Corals","version":"1.0","type":"link"}