1Water Content Detection: Test the water content of the brake fluid to determine whether it needs to be replaced. Applicable to DOT3/DOT4/DOT5.1 brake fluid. 2High Sensitivity Probe: Brake fluid tester adopts high precision sensor and is equipped with bendable tube, which is flexible enough to make detection easier. 3Hd Large Screen: The data will be accurately displayed on the screen, and the readings will be intuitive and clear, so that technicians can learn the brake fluid status from the owner in detail. 4Beep Alarm: Sound and light alarm to quickly detect moisture content. Easy to operate. It is an important tool in the automobile maintenance industry. 5Car Battery Powered: 12V automobile battery power supply, operating temperature range 0?50 , 32?122 . Protection cover design, wear proof and fall proof.