Ideal test kit for commercial pool and spa operators to help comply with tough local ordinances. Chlorine kit tests for free & total chlorine levels from 0-3.0 PPM. Bromine kit tests for bromine levels (Chlorine 1-10 PPM?Bromine 2.0 -10 PPM), simply purchase the low Chlorine/Bromine kit AND the appropriate high slide comparator. To avoid any test contamination, you must also purchase three (3) additional test cells to be used with the high comparator.