50/100pcs Chlorine Dip Test Strips Hot Tub SPA Swimming Pool PH Tester Paper .
Easy to test: Free Chlorine/Bromine ,pH,Total Alkalinity. Test range for total alkalinity: 0 ~ 240 ppm. Total chlorine test range: 0 ~ 10 ppm. Free chlorine test range: 0 ~ 10ppm. Test at both ends of pool twice a week for best results.