Features: Portable Size: This brake fluid tester has a small size and can be easily stored in the car, so you can use it anytime. Wide Applications: This tool can be broadly applied in your home, repairs factories and 4S stores. The probe is magnetics, and it can absorb some iron dirt in the brake fluid during the detection process, thereby improving the purity of the brake fluid. The testing heads with lights, you can see where the test probes are even at night, improving the accuracy of your inspections. With this tool, you can quickly detect the quality of brake fluid, indicate the state of brake fluid, and provide a reliable basis for maintenance and replacement.