Always be there for your reef tank with our Marine Monitor
Enjoy the convenience of our 
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
Test your reef tank on the go
Saltwater aquarium best-sellers
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