50 pieces pool water test strips 3 in 1 measurement of PH chlorine alkalinity
Easy to test: free chlorine / bromine, pH, total alkalinity. Total alkalinity test range: 0 ~ 240ppm. Free chlorine test range: 0 ~ 10ppm. Test at both ends of pool twice a week for best results. PH test range: 6.8 ~ 8.4.