{"product_id":"hanna-hi784-marine-ammonia-checker","title":"Hanna Instruments HI784 Marine Ammonia Checker HC","description":"\u003cp\u003eThe \u003cstrong\u003eHanna Instruments Marine Ammonia Checker HC (HI784)\u003c\/strong\u003e is a digital colorimeter that measures ammonia in your saltwater or reef aquarium far more precisely than a liquid color-card kit. Ammonia is the most dangerous compound for fish and corals, especially in a new tank, after adding livestock, or during a cycle, so an accurate reading matters. Instead of guessing between chart colors, the Checker gives you a clear digital number from 0.00 to 2.50 ppm. Browse more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003ewater testing\u003c\/a\u003e and \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003esaltwater\u003c\/a\u003e supplies at Squeaky's Aquatics.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eWhy Use the Checker HC\u003c\/h3\u003e\n\u003cul style=\"margin:4px 0 0;padding-left:20px;line-height:1.55;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital, not a color card:\u003c\/strong\u003e a fixed wavelength LED and detector read the sample, removing the eye strain and guesswork of matching colors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef-relevant resolution:\u003c\/strong\u003e reads 0.00 to 2.50 ppm of ammonia (NH3\/NH4+) in 0.01 ppm steps, low enough to catch trouble early.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven chemistry:\u003c\/strong\u003e uses an adaptation of the salicylate method; the reagent turns a blue-green tint the meter measures at 610 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and simple:\u003c\/strong\u003e pocket-sized, one-button operation, with automatic shut-off after 20 minutes to save the battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for marine tanks:\u003c\/strong\u003e designed specifically for saltwater aquarium and aquaculture use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eHow to Use\u003c\/h3\u003e\n\u003col style=\"margin:4px 0 0;padding-left:20px;line-height:1.55;\"\u003e\n\u003cli\u003eFill a cuvette with 10 mL of aquarium water, cap it, and place it in the meter to zero the reading.\u003c\/li\u003e\n\u003cli\u003eAdd the ammonia reagent to the same cuvette, cap, and gently invert to mix.\u003c\/li\u003e\n\u003cli\u003ePress the button and let the timed reaction run, then read the ammonia value directly on the display.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eWhat's Included\u003c\/h3\u003e\n\u003cul style=\"margin:4px 0 0;padding-left:20px;line-height:1.55;\"\u003e\n\u003cli\u003eMarine Ammonia Checker HC meter (HI784)\u003c\/li\u003e\n\u003cli\u003eMarine ammonia reagent starter kit (10 tests)\u003c\/li\u003e\n\u003cli\u003eTwo sample cuvettes with caps\u003c\/li\u003e\n\u003cli\u003ePlastic refilling pipette\u003c\/li\u003e\n\u003cli\u003e1.5V AAA battery\u003c\/li\u003e\n\u003cli\u003eInstruction manual and quick-reference guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;margin:6px 0 0;font-size:0.94em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;width:40%;\"\u003eParameter\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eAmmonia (NH3\/NH4+), marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eRange\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e0.00 to 2.50 ppm (mg\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eResolution\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e0.01 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eAccuracy (at 25°C)\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e±0.05 ppm ±5% of reading\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eMethod\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eAdaptation of the salicylate method; LED at 610 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eSample Temperature\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e18 to 29°C for testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eAuto Shut-Off\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eAfter 20 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e86 x 61 x 37.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eBattery\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003e1 x 1.5V AAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;background:#E0F7FA;font-weight:600;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;\"\u003eHI784\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul style=\"margin:4px 0 0;padding-left:20px;line-height:1.55;\"\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eHI784-25 reagent refills\u003c\/a\u003e and other Hanna Checkers for nitrate, phosphate, alkalinity, and calcium.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003eWater conditioners and ammonia detoxifiers\u003c\/a\u003e to correct a high reading.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-mixes\"\u003eReef salt mix\u003c\/a\u003e for clean, ammonia-free water changes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp style=\"margin:6px 0 0;\"\u003e\u003cstrong\u003eIs this for saltwater or freshwater?\u003c\/strong\u003e\u003cbr\u003eIt is designed for saltwater and reef aquariums (and marine aquaculture). Hanna makes a separate freshwater ammonia Checker for freshwater tanks.\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0;\"\u003e\u003cstrong\u003eHow many tests come with it?\u003c\/strong\u003e\u003cbr\u003eThe starter reagent kit covers 10 tests. Refill reagents (HI784-25) are sold separately.\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0;\"\u003e\u003cstrong\u003eWhy is it better than a color-card kit?\u003c\/strong\u003e\u003cbr\u003eThe meter reads the sample optically and shows a digital number, so you are not judging subtle color differences by eye, which is easy to get wrong at the low ammonia levels that matter in a reef.\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0;\"\u003e\u003cstrong\u003eWhat do I do if ammonia reads high?\u003c\/strong\u003e\u003cbr\u003eDo a water change with clean saltwater, use an ammonia detoxifier, and check your cycle and stocking. Retest to confirm the level is dropping.\u003c\/p\u003e","brand":"Hanna","offers":[{"title":"Default Title","offer_id":47476179239131,"sku":"HI784","price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/HI784-1200x1200__74703_0e99911f-c29f-4181-b33d-06b26bb826e2.jpg?v=1755624677","url":"https:\/\/squeakysaquatics.com\/products\/hanna-hi784-marine-ammonia-checker","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}