1. After cleaning the probe, put it in dry air or immerse it into new brake fluid.

2.Press down the work button for 3-5 seconds continously, and then turn the fine tuning clockwise until the second green indicator lights on, and then turn the fine tuning counter-clockwisely until the green indicator put out. Now it can be used to test brake fluid.

3.Immerse the probe into the brake fluid, and press down the work button for a few seconds, then you can judge the brake fluid state by indicator light.

* All the green light indicate the brake fluid is fine, the water content is below 0.5%

* Yellow light indicates the fluid is not so good, the water content is above 0.5%, you can choose to change brake fluid.

* Red light with buzzer sound indicates the brake fluid is very bad, wate content above 2.5%, the brake force decline seriously, and brake fluid should be changed!

4.Please clean the probe and reset the instrument after testing.