The Waterproof, ColorQ® 2x photometer directly measures seven pool & spa tests which includes Free Chlorine, Total Chlorine, Bromine, pH, Alkalinity, Calcium Hardness and Cyanuric Acid. The photometer is easy to use Test Factor Range # of Tests Free Chlorine (DPD) 0-10 ppm 100 Total Chlorine (DPD) 0-10 ppm 100 Bromine (DPD) - uses the Chlorine (DPD) reagent set 0-22 ppm and includes 100 TesTabs® tablet reagents per test factor packaged in blister-style foil.