Saltwater aquarium
Test your reef tank with confidence and keep water in check easily with a digital read-out
Ditch the test strips
Digital Marine Checkers are where it's at
Hear from reef tank owners
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Digital read-out
- Jerry B., Verified Buyer
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Super easy to use
- 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
- 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
How many parameters does it test?
9 parameters
How does it pair with your phone?
Connect via Bluetooth® and use our FREE Hanna Lab App for easy data tracking, export, and analysis.
Do you have multiple tanks?
Record results for up to 25 tanks. You can customize and name each one. Save your measurements for your tanks in separate folders.
The TLC your reef tank needs
Always be there
Maintain pH, salinity, and temperature easily with our
Marine Monitor. Get quick at-a-glance readings. Built-in alarms alert you when parameters are out of range.
Bring the essentials
Have everything you need to test right out of the box with our Reef Professional Kit. Be ready to test Calcium, Alkalinity, Phosphates, and Salinity on the spot.
Reliable results at your fingertips
A customer favorite
Simplify your salinity testing & enjoy the convenience of our popular Marine Salinity Tester. Take readings on-the-go!
Your phone is now a pH meter
With our HALO2 Field Wireless pH Tester, testing with your phone is possible via Bluetooth®. Easily carry it with you!