Car Brake Fluid Tester Mini Electrical Test Tool Brakes Liquid Tests Pen 5 LED Indicator Auto Oil Testing Diagnostic Tools

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 lower boiling point, affect braking performance. Red indicates the brake fluid needs immediate replacement, green represents good condition, yellow indicates the state is acceptable but soon replaced.