Red sea magnesium test kit contains 100 testselement mgaccuracy 10 ppmtest type titrationnumber of tests 60all 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 titratorfor use with all titration test with a high degree of accuracy drop size of 001ml robust coral skeletons are essential for all reefs and only acheivable by ensuring the basic elements calcium magnesium strontium and carbonat