Product Short Description: Calcium Test Kit is helpfull to determine calcium level in Boiler, Cooling, Aquarium Water. Very simple to use can be handle by simple colour determination test Product Description: Calcium Test Kit is helpfull to determine calcium level in Boiler, Cooling, Aquarium Water. Very simple to use can be handle by simple colour determination test For Example 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.