Aquarium Pharmaceuticals Calcium Test Kit accurately measures calcium levels in marine aquariums. Measures calcium levels as low as 20mg/L. Easy to use.

Why test for calcium?

Calcium is one of the most important elements in a reef aquarium. Reef invertebrates such as corals, crustaceans, mollusks and even some types of encrusting algae need calcium to grow and remain healthy. Over time, calcium levels drop as invertebrates use calcium in aquarium water.