Mastertronic Essential, is capable of testing the true essentials of a reef system and this includes alkalinity, nitrate, phosphate, calcium, and magnesium, with the ability to test all these elements, the Aquarist will not need multiple machines and that will save precious cabinet space, less maintenance, consistent water sample volume and most importantly cost savings, along with the ability to perform tests will yield live data and much more accurate results as water chemistry can change over time or even hours.