The C-1805 Round Carbohydrazide Comparator is a component of K-1805 Carbohydrazide CHEMets® Test Kit and is designed to be compared against the color formed in the R-3902 DEHA/Carbohydrazide CHEMets® Refill. The comparator's range is applicable for many boiler applications. Color standards are peach to pink in color and cover a range of 0 to 0.50 ppm carbohydrazide. Increments: 0, 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50 ppm carbohydrazide.