Preparation: Remove the probe cover of the test pen. Lightly press the power button, long press for a second after the screen display can be turned on to set the type of brake fluid.

The step of testing water content.
1.According to the type of brake fluid tested to select the corresponding type DOT3/4/5.1
2. The front end of the test pen metal should be dipped into the brake fluid to make the both metal probes can contact brake fluid surface.
3. According to the water content on the display can judge the performance of the brake fluid.
If the water content If the water content If the water content > 3% ~ 4%, the screen displays red, while there is a alarm; need to replace the brake fluid immediately
4. After the test, 1 minute after all the indicator lights will turn off the test pen into the power saving mode. One battery can be used continuously for a long time and consumes little power.

Note
1. When installing the battery, the metal probe should not touch any object.
2. If the green LED does not light up when you press the power button, you need to replace the battery.
3. After each test, please wipe the liquid on the metal probe.