This is a replacement reagent set for the Hanna Instruments HI758 Marine Calcium Checker. It provides all the necessary pre-measured reagents to perform 25 precise digital measurements of calcium in your saltwater aquarium. Using these refills ensures you can continue to get fast, accurate results from your Hanna Checker, eliminating the guesswork and color interpretation required by traditional chemical test kits.

Each HI758-26 reagent pack is manufactured to high standards and clearly marked with an expiration date and lot number for traceability. The kit is designed for simplicity and ease of use, allowing aquarists to quickly add a water sample and the reagents to the cuvette for a direct digital readout. This pack contains enough reagents for 25 individual tests, making it a cost-effective way to continue monitoring a critical element for coral health.

This reagent set is essential for any reef aquarist who owns the Hanna Marine Calcium Checker and needs to replenish their testing supplies. It is ideal for hobbyists keeping stony corals (SPS/LPS), clams, and other invertebrates that consume calcium to build their skeletons. Consistent and accurate testing with these reagents allows for precise dosing of calcium supplements, helping to maintain stable water parameters and promote healthy coral growth and coloration.