Use the Salifert Magnesium Profi-Test Kit to accurately measure magnesium in your aquarium.

Magnesium is a vital element in any aquarium as it is used by corals and coralline algae to build strong skeletal formations and healthy development. It's also an element of chlorophyll which is necessary for vital photosynthesis to occur.

Salifert Test Kits are very sensitive and will provide the most accurate reading possible. The magnesium reading is not affected by strontium or calcium levels, so you can be confident of the most precise readings.