Portable Water Quality PH/CL2 Chlorine Tester Level Meter PH Tester for Swimming Pool Quite an essential tool for swimming pool and spa. Ideal for simple operations to test water PH and CL2, no more chemicals or no more guess work. Large screen shows the test result on both PH and Chlorine level for easy reading. 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.