Product Short Description: This test kit reads the total phosphate level in parts per million (ppm), which are equivalent to milligrams per liter (mg/L) from 0 - 50.0 ppm (mg/L). Product Description: Determination of PHOSPHATE level very Simple way. Phosphate measurement is used to control scale and corrosion inhibitor levels in boilers and cooling towers. Reactive phosphate will give a positive reaction.