This reagent kit for high range phopshate, 0 to 30ppm, comes in sachets which are pre-measured to allow users to achieve fast and accurate measurements. These reagents pair with the Hanna Pocket Colorimeter HI-717. The method for this reagent set is the Amino Acid Method, where the reaction between phosphorus and reagents will cause a blue tint in the sample. The results are displayed in ppm of phopshate.