The MI527-25 Iodine Powder reagent kit includes high-quality reagents that are ready-to-use with Milwaukee's MW13. The reagents and meter use the Adaptation of the Standard Methods for the Examination of Wastewater 18th edition DPD Method. The reaction between Iodine and the reagent causes a pink tint in the sample. Simply add the reagent to the sample, wait for the reaction to take place and the photometer determines the concentration based on the color. The reagents are designed for use with samples that have an expected range of 0.0 to 12.5 ppm (mg/L).