This chlorine 5-in-1 test strips professional tests for total hardness, total chlorine, total bromine, free chlorine, pH, and total alkalinity. Designed to meet the unique needs presented by the higher water temperatures in spas, AquaChek spa 5-in-1 test strips provide comprehensive testing ensuring both clean and healthy water and protection against damage from ph. fluctuations and scale formation. To keep your spa at its best, test before and after each use and treat the water regularly. Available in 12 per case.