Description: This is an electro-tester for testing pH and chlorine (Cl2) levels in water. Light weight and handy.No chemical testing and solutions needed. Ideal for simple operations to test water PH and CL2, no more chemicals or no more work. Doesn't need too many steps. Large screen shows the test result on both PH and Chlorine level for easy reading. Material: Engineering Plastic Specification: Color: White Size: Approx. 18x11.6x3.1cm / 7.09x4.57x1.22inch Power Source: 1 Piece of AA Battery (Not Included) PH Level within The Safe Measurement Range: 7.2-7.8 Chlorine Levels within The Safe Measurement Range: 1.2-1.7 PPM How to Use it: PH measurement (without battery, first turn the knob to the pH direction as far as it can go). 1. Use fine sandpaper to gently wipe the metal bar back and forth for 3-5 times to remove the scale, and use a clean paper towel or cloth to wipe it clean, and then start the measurement. (1) place the test rod vertically in the tested solution to the black position. (2) The pointer will move slowly until it stops swinging and then read (about 3 minutes). (3) Take out the test rod gently and wash it with clean water Package Includes: 1 Piece of Swimming Pool Water Quality Tester PH/CL2 Chlorine Tester Note: The colors deviation might differ due to different monitor settings, pls kindly understand Pls allow 1-3mm error due to hand test