Item Type: Water Quality Tester_x000D_Material: ABS_x000D_Weight: Approx. 37g/1.3oz_x000D_Application: Tap water, cold water, barreled purified water, residential water station, water filtered by pure water machine, aquarium water, anti sputtering, automatic dormanance_x000D_Measurement Accuracy: 2%_x000D_Product Size: Approx. 138x25x15mm/5.4x1.0x0.6in_x000D_Battery: LR44 button battery x 2(shipped without battery) 1LCD Display and Auto Lock Function: The water quality tester is equipped with a LCD display for easier reading, and auto lock function for easier use. 2Auto Shut Down: One key control, simple operation, easy to use. If not used for a long time, this water quality tester will automatically shut down in five minutes, extending the service life. 3Protective Cover: This water quality tester is made of premium ABS material, with protective cover design, remove when using, cover up when not in use, beneficial to product life. 4Easy to Use: Just turn TDS meter on and stir water gently, then stabilized readings will be auto locked on LCD in seconds, easy and convenient operation. 5Usage: Test the purity of drinking water to ensure it's healthy, monitor if RO DI System works properly, whether filter need replaced, maintenance aquarium, hydroponics (test nutrients), pool and spa, etc.1 xWater Quality Tester