The red sea calcium pro test kit is an advanced calcium titration test kitelement caaccuracy 25 ppmtest type titrationnumber of tests 75 all pro test kits come in a durable plastic housing and use optically clear analytical lab grade glass test vials easy to use drop and shake titrator for use with all titration test with a high degree of accuracy drop size of 001mlrobust coral skeletons are essential for all reefs and only acheivable by ensuring the basic elements calcium