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The brake fluid tester is used to determine the brake fluid quality.
The brake fluid tester can be changed by changing the conductivity to determine the water content of the brake fluid. The humidity is clearly displayed thanks to LEDs. High moisture content reduces boiling point and thus affects braking performance. Red indicates that the brake fluid needs to be replaced immediately, green indicates that the brake fluid is in good condition and yellow indicates that the brake fluid is still in good condition but will change.