1An electrotester for testing pH and chlorine (Cl2) levels in water for routine monitoring of pH and chlorine levels of swimming pools, spas, and different water sources. 2Ideal for simple operations to test water PH and CL2, no more chemicals, or no more work. It doesn't need too many steps. 3Recommended chlorine level for pool and spa is 1.2 to 1.7ppm and 7.2 to 7.8ph for PH Level for pool and spa. 4Largescreen displays the test result on pH and chlorine level for easy and accurate reading. 5Small size and easy to carry, used to ensure that your swimming pool/spa water is safe, comfortable, and noncorrosive. Item Type: Water Quality Tester Material: ABS Color: As shown in the picture Tester Body Size: Approx.125x180mm/4.92x7.09in Probe Size: Approx.20x150mm/0.8x5.9in Weight: Approx.258g/9.1oz Battery: 1 x AA battery(Not included) Application: Swimming pool water quality tester, pH test pen Specification The recommended chlorine content for swimming pools and spas is 1.2 to 1.7 ppm The recommended pH for swimming pools and spas is 7.2 to 7.8 How to Use 1. Install the battery. 2. Turn the knob to select PH or CL2. 3. Put the probe into the water and you can read it. 1 x Water Quality Tester(Battery Not Included) 1 x Instruction Manual 1. Please allow 1& 8209;2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.