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Recommended Chlorine And Ph Level For Pool And Spa: 1.2 to 1.7ppm and 7.2 to 7.8ph 2-In-1 Function: This water quality tester can measure 2 important parameters: ph, cl2 chlorine Simple Operation: Easy to operate, no more chemicals and easy maintenance. Large screen displays the test result on pH and chlorine level for easy and accurate reading and recording Application: Digital water tester for measuring chlorine and ph level,widely used in drinking water, swimming pool, spa, fish tank, aquarium Note: If pool water is not balanced correctly then the chlorine sanitizer won't be working, and it will affect the skin and eyes