Red Sea’s Reef Foundation 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. This test kit enables accurate dosing of the Reef Foundation Supplements, which are part of the complete Red Sea Reef Care Program. package size/volume: Calcium Pro Ca- 5 ppm Accuracy, 75 tests KH/Alkalinity Pro – 0.05 meq/l accuracy, 75 tests. Magnesium Pro – 20 ppm accuracy, 60 tests.