50x 4-In-1 PH Test Strips Rapid Water Testing Kit for Hot Tub Spa Pool Pond
Swimming Pool Chlorine PH/CL2 Water Quality Tester Digital Monitor Spa Hot Tub. PH: 6.8~8.4ph. Easy to use: No complex tools needed, dip the strip for 2 seconds, compare colors, and get results in 30 seconds, easy to use.