【Practical Function】: With precise liquid detection, this tester ensures your brake system is always operating at its safest. By accurately measuring water levels in the brake fluid, it prevents potential brake failures caused by excess water, which can reduce braking efficiency and compromise overall safety.

【Clear Indicator】: Equipped with five LED indicators, the tester provides an easy-to-read display of brake fluid quality. The LEDs remain steady without flickering for clear and reliable readings. You can refer to the explanation below for details on each combination and its corresponding water content level.

【Convenient & Portable】: Measuring just 0.8"×6.0", the sleek and pen-like design makes it easy to carry and handle, whether you're working in a garage or on the go. Our brake liquid testing pen allows for comfortable one-handed operation, ensuring that fluid checks are as convenient as possible.

【Simple Operation】: To use the tester, simply unscrew the brake fluid reservoir cap and remove the pen's cap. Immerse the probe into the fluid, press the power button, and the green LED will light up. Hold for one second to view results; the pen automatically shuts off after 12 seconds.

【Wide Application】: This versatile brake fluid tester is compatible with a wide range of commonly used brake fluids, including DOT 3, DOT 4 and DOT 5.1. It's an essential tool for car owners and professional mechanics, ensuring safe and reliable braking performance across different vehicle types.