NOTE: It is not recommended to immerse the detector in water other than a pool or spa. The recommended chlorine level for pools and spas is 1.2 to 1.7 ppm The recommended pH for pools and spas is 7.2 to 7.8 HIGH QUALITY WATER TESTER- SAFE to chlorine based tablet pool, pH needs to be correct. If pool water is not balanced correctly then the chlorine sanitizer won't be working,This water quality meter is an essential tool for quick and accurate pH and chlorine (Cl2) levels measurements. PREMIUM QUALITY - The water quality tester is made of high quality plastic case, which is small and light, strong and durable. Easy to carry, No chemical agent need and easy maintenance. EASY TO READ DISPLAY - The large screen displays the test results of pH and chlorine, and the reading is convenient and accurate. Designed for family size pools or spas,A wonderful choice for your pool. PRACTICAL AND USEFUL - pH should be neither too acidic nor basic in order to feel comfortable,chlorine ph test kit is an ideal tool to keep your pool or spa in a safe chlorine and PH range.