C-2504 Low Range Chlorine Comparator is a component of K-2504 Chlorine (free and total) CHEMets Visual Test Kit and is designed to be compared against the color formed in R-2500 Chlorine CHEMets Refill The comparator's range is applicable for many drinking water and disinfection applications. Color standards are pink in color and cover a range of 0 to 1.0 ppm chlorine (Cl₂).