Brake fluid tester pen with 5 LED indicator lights.
Features & Specs:
You can use it to check the condition of Dot 3 & Dot 4 brake fluid.
5 LED lights display the percentage of moisture content in brake fluid.
Auto power off
Need 1 AAA battery (not included)
Brake fluid detection pen is based on the change in conductivity to determine the moisture change brake fluid. It shows clearly the extent of moisture contained by the light-emitting diode, high moisture content will lead to a lower boiling point, affect braking performance. Red indicates the brake fluid needs immediate replacement, green represents the good condition, yellow indicates the state is acceptable but soon replaced.
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