MuchBuy Swimming Pool Spa Water Ph/cl2 Chlorine Tester Meter Ph Ideal for simple operations to test water PH and CL2, no more chemicals or no more guess work Recommended Chlorine Level for pools and spas is 1.2 to 1.7 ppm Recommended PH Level for pools and spas is 7.2 to 7.8 Large screen shows the test result on both PH and Chlorine level for easy reading Power supply: 1 * AA battery (not included)