5 in 1 test strips are great for quick, on-site evaluations of water quality with reliable results on every test. These multi-parameter test strips test for five water quality measurements on 1 strip. Contains 50 tests.Parameter List:Free Chlorine (0-10 mg/L)Total Chlorine (0-10 mg/L)Total Hardness (as CaCO3, 0-25 gpg and 0-425 mg/L)Total Alkalinity (as CaCO3, 0-240 mg/L)pH (6.2 – 8.4)