The HI-753-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Chloride Checker® HC. These reagents follow the Mercury (II) Thiocyanate Method in which the reaction between chloride and the reagents causes an orange tint in the sample. By simply adding the two reagents from the HI-753-25 set, the reaction will take place and the HI-753 will determine the concentration from the colour that is produced. The results will be displayed in ppm of chloride. These reagents are designed to be used with samples that have an expected range of 0.0 to 20.0 ppm chloride.