The HI96779-03 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate colorimetric measurements. These reagents follow the Standard Methods for the Examination of Water and Wastewater method in which the reaction between chlorine dioxide and reagent causes a purple tint in the sample. By simply adding the HI96779-03 reagents to the sample, a reaction will take place and a compatible photometer can be used to determine the concentration from the color that is produced. The results will be displayed in mg/L (ppm) of chlorine dioxide. These reagents are designed to be used with samples that have an expected range of 0.00 to 2.00 mg/L chlorine dioxide.