This tester can be used to test the quality of the brake fluid. It can indicate whether the brake fluid under test can be still used safely or needs to be replaced. It is a very good tool for ensuring good braking effect and driving safety.

• If the two green LEDs light up, the quality of the brake oil is good.

• If the yellow LED lights up, the quality of the brake oil is bad.

• If the red LED lights up and the built-in buzzer sounds, the quality of the brake oil has deteriorated and the brake oil is unsafe to use.