The HI-726-25 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Nickel High Range Checker® HC. These reagents follow an adaptation of the photometric method in which the reaction between nickel and the reagent causes a blue tint in the sample. By simply adding the packet of HI-726-25 reagent to the sample, the reaction will take place and the HI-726 will determine the concentration from the colour that is produced. The results will be displayed in g/L of nickel. These reagents are designed to be used with samples that have an expected range of 0.00 to 7.00 g/L nickel.