Features: 1. Check the car brake oil quality. 2. 5 LED lights display the percentage of moisture content in brake fluid,how the test results more accurate. 3. Press the button for power on, green LED will light up. 4. Insert the tester into reservoir for a second, then the results will be indicated correctly by LEDs. 5. Testing DOT 3, DOT4, DOT5 brake fluid. 6. Auto power off,Supports 1 LR03 AAA batteries (not included).
