Ensure your vehicle’s braking system is always at its best with this Digital Brake Fluid Tester Pen. Designed for DOT3, DOT4, DOT5.1, ENV6, and ENV4 brake fluids, this compact, portable tester quickly measures the moisture content in your brake fluid. With clear LED indicators, it allows you to make informed maintenance decisions and prolong the life of your braking system. Main Features: Wide Compatibility – Tests DOT3, DOT4, DOT5.1, ENV6, and ENV4 brake fluids Compact & Portable – Small, lightweight design makes it easy to carry and use anywhere Quick & Easy Testing – Dip the probe into brake fluid, press the button, and read moisture content in seconds Clear LED Indicators – 5 LED lights indicate water percentage in the brake fluid for instant readings Premium Quality – Made of durable nylon for long-lasting use (requires 1 AAA battery, not included) Safe & Reliable – Helps prevent brake system failure by monitoring fluid moisture content Specifications: Item Type: Brake Fluid Tester Pen Compatibility: DOT3, DOT4, DOT5.1, ENV6, ENV4 brake fluids Power Supply: 1 × AAA Battery (not included)