Hanna Instruments Calcium Reagents, 25 ct. for use with HI758 Marine Calcium Checker

These replacement reagents are a necessity if you plan to keep using your Hanna tester. Best price I could find on the internet. Does not come with the digital tester or test tubes - this is just the replacement reagent. The one I received had an expiration date 18 months from now which is way longer than I need but great for people who only have one tank or who test less frequently.

Works great will buy again

I keep up with the testing of my tank and Hanna checkers is what I use and always need to refill at a affordable price

Gives good results

I trust this brand of testers more than any other