Red Sea Reef Foundation Pro Test Kit Ca,KH,Mg PLUS Liquid Reef Foundation A,B,C 500ML each Advanced titration test kits for accurate measurement Ca | KH | Mg Red Seas Reef Foundation Pro Test Kit includes high accuracy titration tests for the accurate measurement of the elements calcium, magnesium and alkalinity (KH) which are the basic foundation elements of coral skeletons. All of these elements need to be available in balanced proportions for sustainable successful coral health and growth. Red seas Reef Foundation Pro Test Kit enables accurate dosing of the Reef Foundation Supplements, which are part of the complete Red Sea Reef Care Program