pH CL2 Chlorine Level Swimming Pool Tester Displays water test result for both pH and Chlorine (Cl2) level Recommended pH level for pools and spas: 7.2 ~ 7.8pH Recommended chlorine level for pools and spas: 1.2 ~ 1.7ppm Easy to use and have result instantly and accurately Power Supply: 1 x AA 1.5V Alkaline Battery