6 In 1 Multipurpose Chlorine PH Test Strips SPA Swimming Pool Water Tester .jj

Test Range:Total hardness: 0 -1000, Total chlorine range: 0-10, Cyanuric Acid:0-240, Free bromine range: 0-22, PH range: 6.8-8.4, Total alkalinity: 0-240. Total chlorine range: 0-10. Easy to use.Test at both ends of pool twice a week for best results.

eBay