1. This device provides a reference for judging whether the brake fluid is still usable or needs to be replaced.It mainly used for detecting the quality of the brake fluid, so as to ensure that the brakes are sensitive and drive safety. 2. LCD display the test result to tell you the quality of brake fluid. 3. Long probe designed for Motor vehicle,no need to take oil outside. 4. The product uses the optical principle to detect the oil and to accurately determine the oil contamination situation. 5. Specification: Probe diameter: 5.3mm Oil hole requirement: diameter more than 6mm, curvature less than 30 degree Hose length: 800mm Detection type: turbine oil