The HI-749-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Chromium VI Low Range Checker® HC. These reagents follow the Diphenylcarbohydrazide Method in which the reaction between chromium VI and the reagent causes a purple tint in the sample. By simply adding the packet of HI-749-25 reagent to the sample, the reaction will take place and the HI-749 will determine the concentration from the colour that is produced. The results will be displayed in ppb of chromium VI. These reagents are designed to be used with samples that have an expected range of 0 to 300 ppb chromium VI.