ZKTOOL New Upgraded Version Brake Fluid Tester Pen, Test DOT3 DOT4 DOT5.1 ENV6 ENV4 Brake fluids,Brake Fluid Moisture Analyzer with 5 LED Indicators,Brake Fluid Liquid Tester Pen
- ...h the type of brake fluid, the initial default is DOT3, and each time the LED from low to high turns on three times, one brake fluid is switched. If you want to use one of the brake fluids, when the LED light is in the brake fluid type gear, please release the top button when it flashes twice, and insert the bottom sensor plug into the brake fluid (brake fluid test pen 2/3 ), and you will understand percentage of water in your vehicle’s brake fluid.