Brake Fluid Liquid Tester Pen with 5 LED Indicators, Calibrated For DOT3 DOT4 Brake Fluid

Test the car brake fluid quality quickly to check whether it’s qualified, which can remind you to change the brake fluid when necessary to avoid traffic accident

The LED indicators will show percentage of water in the brake fluid with 3 colors green yellow and red

Calibrated for cars using DOT4 and DOT3 brake fluids (But DOT3 is almost replaced by DOT4 because DOT4 has better performance)

Only takes seconds to know the results,very easy to use

CE and RoHS approved. Protective cap included.Takes 1 x AAA/1.5V battery (not included)