![Hanna Instruments Calcium Checker (Ca2+)](http://popcorals.com/cdn/shop/products/AE3D610B-C3A3-4CD5-8AAF-4F336363E33C_4_5005_c_{width}x.jpg?v=1637214378)
The HI758U Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure calcium. Required for the development of calcium carbonate skeletons of coral reefs, calcium is a crucial component of marine waters. Designed as a more accurate alternative to chemical test kits, the HI758U provides quick, accurate results in a few easy steps.