The HI83730-20 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate colorimetric measurements. These reagents follow an adaptation of the EC 2568/91 method in which the reaction between peroxides and the liquid and powder reagents causes a yellow tint in the sample. By adding the HI83730A-0 and HI83730B-0 reagents to the sample, a reaction will take place and the HI83730 photometer can be used to determine the peroxide value from the color that is produced. The results will be displayed in meq O₂/kg. These reagents are designed to be used with samples that have an expected range of 0.0 to 25.0 meq O₂/kg.