Hanna HI758-26 Calcium Reagents, 25 ct. for use with Hanna HI758 Marine Calcium Checker

The Hanna checkers are by far the best test kits on the market. If your serious about your tank, I would recommend biting the initial cost. The refills are all cheap except calcium, but you dont need to test it that often. Best $8 spent for reefing #Lifegoals

Love this test! I will never go back to reading charts and counting drops! Test with confidence.

Purchased the calcium, alkalinity and phosphate checkers, wish they made one for nitrate and magnesium so I could say goodbye to the rest of my test kits.

I will recommend it to other.