The electronic brake fluid tester from BRILLIANT TOOLS is designed for fast and easy measurement of water content in the brake fluid. This electronic tester is ideal for testing the quality of brake fluid. Moreover, it is equipped with LEDs to indicate percentage of water in the brake fluid, so users can decide if the brake fluid needs to be replaced. Colour: Black Material: Plastic For fast and easy measurement of water content in the brake fluid Green: OK, no water content measured in the brake fluid Green/yellow: less than 1% water content measured in the brake fluid Green/yellow/yellow: approximately 2% water content measured in the brake fluid Green/yellow/yellow/red: approximately 3% water content measured in the brake fluid, replacement of brake fluid recommended Green/yellow/yellow/red/red: at least 4% water content in the brake fluid, brake fluid must be replaced Suitable for brake fluids: DOT3, DOT4, DOT5.1 Not suitable for DOT5