C-6001 Low Range Iron Comparator is a component of K-6210 Iron (total and ferrous) CHEMets Visual Test Kit and K-6010 Iron (total and soluble) CHEMets Visual Kit is designed to be compared against the color formed in R-6201 Iron CHEMets Refill and R-6001 Iron CHEMets Refill. The comparator's range is applicable to many applications including surface and industrial process waters. Color standards are orange in color and cover a range of 0 to 1 ppm iron (Fe).