Hear from reef tank owners
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Digital read-out
"So simple and accurate. Why do it old school?"
- Jerry B., Verified Buyer
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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
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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
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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
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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
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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
Up your testing game
Meet our Marine Master
Monitor your saltwater aquarium easily
Always be there for your reef tank with our Marine Monitor
Test your reef tank on the go
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