This Brake Fluid Tester Digital can measure the water content in the brake fluid to determine whether the brake fluid needs to be replaced. It helps you do regularly brake fluid check, make sure you drive in safety condition. 

• LCD digital display, intuitive, easy to understand. 

• It can detect brake fluid, including DOT-3, DOT-4, and DOT-5.1.

• There is a backlight display function, in a dark place can also see the screen clearly. 

• When red light flashes, the brake oil is in an unfavorable state When alarms, the brake oil must be replaced.