6 in 1 Strip developed specifically for Hot Tubs using Bromine or Chlorine. (50 strip pack) Test includes; Total Chlorine (0-10ppm), Total Bromine (0-20ppm), Free Chlorine (0-20ppm), Total Alkalinity (0-240ppm), pH (6.2-8.4), Total Hardness (0-1,000ppm)