Brake Fluid Tester Pen – 5 LED Indicators | Instant DOT 3/4/5.1 Moisture & Safety Check Tool

Maintain your vehicle’s braking performance with this Brake Fluid Tester Pen, designed to give quick and accurate readings of moisture levels inside your brake fluid. Featuring 5 bright LED indicators, it instantly shows the condition of your DOT 3, DOT 4, or DOT 5.1 brake fluids, helping you determine whether it’s safe or time for a replacement.

Moisture in brake fluid reduces braking efficiency and increases risk of brake failure. This tester provides a clear, visual assessment by detecting water percentage within seconds. Simply remove the reservoir cap, dip the metal sensor tip, press the button, and read the LED result — making it perfect for both beginners and professionals.

Built with a durable pen-style body, it is compact, lightweight, and easy to carry in your glovebox or toolbox. The auto-shutoff feature helps conserve battery life, while the stainless-steel probe ensures long-term accuracy and reliability.

Ideal for car owners, mechanics, workshops, and roadside technicians, this tool helps prevent overheating, brake fade, and risky driving conditions. Regular testing can save money on repairs and ensure safer braking performance.

Keep your vehicle running safely with this 5-LED Brake Fluid Tester Pen, the smart and essential tool for every car maintenance routine.