The OEM 25267 Brake Fluid Tester easily checks moisture content in any brake fluid. Get test results in 1 second. Multi-Colored LED panel for easy recognition. Green LED (OK or less than 0.5-Percent), No water contained in the brake fluid. Green/Yellow LED Less than 1-Percent of water content in brake fluid. Green/Yellow with Yellow LED. Approximately 2-Percent of water content in brake fluid. Green/Yellow with Yellow and Red. Approximately 3-Percent water content in brake fluid. Automatic shut off.