Brake Fluid Tester Pen — LED Moisture Indicator for DOT 3 & DOT 4

Keep your brakes safe with this easy-to-use brake fluid tester pen. Simply dip the probes into the brake fluid reservoir and the 5 LED indicators instantly show the moisture level, so you know exactly when your DOT 3 or DOT 4 fluid needs changing.

Compact and battery-free, this tester gives fast, accurate readings without any guesswork. A simple preventive check that helps maintain stopping power and extends the life of your brake system.