On or Off:
Press the power button and hold for more than 1s to turn on, the beep will beep once, the display will light up, and will enter the test state; in the power on state, press the power button to shut down.
Function Switch:
The default brake fluid type detected by the detection pen is DOT3; Press the function swtich button to switch to DOT4; Press again to switch to DOT5.1; Press again to return to DOT3, and so on.
Moisture Detection:
After power on, select the type of brake fluid to be tested. Before testing, make sure the metal probe is clean, immerse the matal part of the testing head in the liquid to be tested for 3 seconds, wait for the display to stabilize, observe the state, and read the valve. When the valve is 0-2%, the green backlight is bright, indicating that the brake oil can still be used; 2-3%, the bright yellow backlight, the buzzer sounds slowly, indicating that the brake oil needs to be replaced; more than 3#, the bright red backlight, the buzzer quick sound, please change the brake fluid immediately.