Red Sea's Calcium Pro Test Kit is an advanced calcium titration test, measuring the level of calcium in your reef aquarium to an exceptionally high accuracy of 5 ppm. This test kit enables the accurate dosing of Red Sea's Reef Foundation A (Calcium/Strontium) and Reef Colors Supplements, which are part of the complete Red Sea Reef Care program. The kit includes a durable, chemical resistant plastic case and analytical grade glass vials. The Titrator included inside is high precision and easy to use with one hand. Includes materials for up to 75 tests.