Water Quality PH/CL2 Chlorine Tester Level Meter PH Tester for Swimming Pool Spa PC101 Recommended chlorine level for pools and spa is 1.2 to 1.7ppm Recommended pH level for pools and spa is 7.2 to 7.8 Power Supply: 1 x AA 1.5V Alkaline Battery probe (only): 48mm long (not included black band) probe with handle: 150mm long