KKmoon Water Quality PH/CL2 Chlorine Tester Level Meter for Swimming Pool Spa 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. No chemical agent needed, easy to use it. Easy to use and obtain result instantly and accurately.