Item Type: Water Quality Tester Material: ABS Weight: Approx. 37g/1.3oz Application: Tap water, cold water, barreled purified water, residential water station, water filtered by pure water machine, aquarium water, anti sputtering, automatic dormanance Measurement Accuracy: 2% Product Size: Approx. 138x25x15mm/5.4x1.0x0.6in 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