Features: Designed for checking the quality of brake fluide quality simply. 5 LEDs to indicate percentage of water in the brake fluid. Automatically power off. Small and light to carry for more convenience. An excellent helper for your journey. Technical specifications: Green: Battery IN ORDER, that is, the brake fluid does not contain water Green / yellow: brake oil in water content less than 1%, better brake fluids performance, ease of use. Green / yellow / yellow: brake oil in water content about 2%, the brake fluid can continue to use. Green / yellow / yellow / red: brake oil in water content of about 3%, the proposed replacement of brake fluid. Green / yellow / yellow / red / red: brake oil in water content of not less than 4%, the brake fluid must be immediately replaced with the responsibility for very dangerous. Specification: Type: Brake fluid tester Material: Light emitting diode Quantity:1pc Item Color: Black Compatible with: All vehicles Battery : 1*LR03 AAA 1.5V battery (not included) Size; 15.5*2.5cm/ 6.1* 1"(H*D) Net Weight: 0.04kg / 1.4oz Package contents: 1 Pc Please Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Picture just as a reference.the actual delivered goods shall prevail! 2. Please allow 1-2 cm deviation exists due to the different measuring way Thanks for your understanding :)