Brake Fluid Moisture Tester

Easy to check your cars' brake oil quality.

For testing any Mineral Oil Brake Fluid DOT3 DOT4 DOT5.1

Brake fluid detection pen is based on the change in conductivity to determine the moisture level in your 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 replace soon.

1, The green LED lights = water content in the brake fluid H2O <1.5%, brake fluid good.
2, The yellow LED lights = brake fluid water content H2O = 1.5% to 3%, can continue to use, test again 1-2 months.
3, The red LED lights = water content in the brake fluid H2O> 3%, can not continue to use the brake fluid, needs to be replaced.
4, LED red flashing: requires battery replacement.
5, Green / yellow / yellow / red / red: shows water content of at least 4%, the brake fluid must be replaced immediately.