The measuring instrument allows for quick and easy inspection of the water content in brake fluid. The key parameter determining the quality of brake fluid is the boiling point, which is directly related to the water content. A water content of approximately 3.5% lowers the fluid's boiling point by about 100°C. Brake fluid has strong hygroscopic properties, which is why regular quality checks are so important. The meter operates on the principle of measuring the water content in brake fluid. Brake fluid should not contain more than 1.5% water, with an acceptable content condition up to about 3%; exceeding this value requires the brake fluid to be completely replaced. Professional meter for brake fluid quality control. Compatible with all types of modern brake fluids. The quality indicator is illuminated in 3 colors: green, yellow, and red, depending on the measured value. Operates with 1 AAA battery. Compatible with DOT 3, DOT 4, DOT 5.1. Warning – NOT COMPATIBLE WITH DOT 5. Accessory type: car accessory.