Brake Fluid Tester Pen with 5 LED Indicators Auto Brake Diagnostic Testing Tool for DOT3 DOT4 (BLACK+)

WHY USE THE TESTER?  It's dangerous not to check brake fluid for a long time, apt to traffic accident.  RINENG brake fluid tester can easily help you determine whether it's time for you to change your brake fluid. Regular inspection,avoid to traffic accident, make driving safety.   ??PORTABLE DEIGN? Brake fluid tester is small compact size that have Super strong ABS shell, easy to carry.  Work on Two Brake Fluid Types of DOT3, DOT4 car brake fluid. ??EASY TO USE? Brake fluid tester pen that have high quality electrical conductivity metal design to check the quality of brake fluid  in car only takes seconds to know the results, very easy to use. ??POWER SUPPLY? Operated by a AAA 1.5V battery and automatically off. ??5 LED INDICATORS? 5 LEDs to indicate percentage of water in the brake fluid with three colors green yellow and red.  Green/Yellow/yellow/red: Approx.3% of water content in brake fluid. The brake fluid should be changed.  Green/Yellow/yellow/red/red: At least 4% of water content in brake fluid. The brake fluid must be changed urgently! Extreme danger!  Green/Yellow/yellow/red: Approx.3% of water content in brake fluid. The brake fluid should be changed. Green/Yellow/yellow/red/red: At least 4% of water content in brake fluid. The brake fluid must be changed urgently! Extreme danger! ??SIZE?6.1×0.9×0.7inches/154×19×24mm ??NET WEIGHT?28g ?NOTES: The brake fluid tester is only calibration for DOT4 and DOT3 brake fluids. 2x brake fluid tester(Battery Not Included). You shall put the probes into the fluids.