Aquarium Testing Equipment | Hanna Instruments

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HI713 Low Range Phosphate Colorimeter - Checker® HC $67.99

HI781 Marine Nitrate Low Range Checker® HC $67.99

HI783 Marine Magnesium Checker® HC $67.99

HI782 Marine Nitrate High Range Checker HC $67.99

HI774 Marine Phosphate Ultra Low Range Colorimeter - Checker® HC $67.99

HI772 Saltwater Aquarium Alkalinity Colorimeter (dKH) Checker® HC $67.99

HI758U Saltwater Aquarium Calcium Colorimeter - Checker® HC $67.99

HI764 Saltwater Aquarium Ultra Low Range Nitrite Colorimeter - Checker® HC $67.99

HI736 Saltwater Aquarium Ultra Low Range Phosphorus Colorimeter - Checker® HC $67.99

HI755 Saltwater Aquarium Alkalinity Colorimeter (ppm) - Checker® HC $67.99

HI780 Marine pH Checker® HC $67.99

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Hear from reef tank owners

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Digital read-out

"So simple and accurate. Why do it old school?"
- Jerry B., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Super easy to use

"I love the fact that it gives an exact measurement without having to guess the shades of colors!"
- Tammy K., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
A must-have

"If you are really looking for reliable numbers, you need to get this Checker; I highly recommend it."
- Charles W., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Finally no doubt

"I know that pH testing is simple, but choosing between those colors is just a pain and you are never really sure. Now I am. Best $$$ I ever spent."
- Robert D., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Absolute masterpiece

"With this new Nitrate High Range Checker, getting Nitrate readings for my reef tank is a breeze. As with all Hanna Instruments Checkers, they are a thousand times better by having a digital reading over those color matching test kits. Thanks Hanna for the great checker!"
- Tony P., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Quick and accurate

"Thanks so much for making testing fast and for giving me a better and more accurate reading! Love, love, love your products!"
- Angelica Q., Verified Buyer