Red Sea Magnesium Pro Test Kit - Advanced titration magnesium test kit. Red Sea's Magnesium Pro Test Kit is an advanced titration test, measuring the level of magnesium in your reef aquarium to an exceptionally high accuracy of 20 ppm. The Magnesium Pro Test test kit enables the accurate dosing of Red Sea's Reef Foundation C supplement (magnesium) which is part of the complete Red Sea Reef Care Program.