Calcium Pro Reef Test KitAdvanced titration test measuring the level of calcium in your reef aquarium, with exceptionally high accuracy of 5 ppm Red Seas CALCIUM PRO Reef 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 Seas Reef CALCIUM + Foundation A (calcium strontium) and Trace Colors supplements, which are part of the complete