HI-720 Calcium Hardness Checker

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A single-button operation makes this pocket-sized colorimeter Checker ideal for use on-site to test pool and spa water.

As a more reliable alternative to chemical test kits, the HI-720 colorimeter Checkers allows you to measure calcium hardness in water in four, simple steps. The Checker is powered with a single AAA battery, and has an auto power off feature after 10 minutes of inactivity to preserve battery life.