Make aquarium water testing easy with Checker Colorimeters from Hanna Instruments. Powered by a single AAA battery, the Hanna Calcium Checker will display Calcium readings with the single push of a button. The Hanna Calcium Checker measures in ppm.

Calcium in a reef aquarium should be between 380-450 ppm. Strive to keep levels stable. Testing weekly and recording the results in a tank journal or log should help! For more aquarium product news and reviews, subscribe to our YouTube channel.

Detailed specs and product reviews about the Hanna Instruments Calcium Checker are available on our website: