High quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Phosphorus High Range Checker® HC. 
These reagents follow the Amino Acid Method in which the reaction between phosphorus and reagents causes a blue tint in the sample. 
These reagents are designed to be used with samples that have an expected range of 0.00 to 15.00 ppm (mg/L) phosphorus.