Specification: Brand new Type: Brake Fluid Tester Material: Plastic Color: As the pictures shown Quantity: 1PC Main function: Check the car brake oil quality Features: Quick and easy way to test for moisture content in the brake fluid; results appear in seconds; Sturdy design: the tester has been greatly improved. Widely use: Testing dot3, dot4, dot5 brake fluid. LED Indicator Display: The green LED lights = water content in the brake fluid H2O <1.5%, brake fluid qualified The yellow LED lights = brake fluid water content H2O = 1.5% to 3%, can continue to use, test again six months later The red LED lights = water content in the brake fluid H2O> 3%, can not continue to use the brake fluid needs to be replaced Red LED: change brake fluid LED red flashing: replacement LED yellow: low moisture content, check again in six months LED green: brake fluid lines / cell row Technical parameters: Green: OK, that is, brake fluid does not contain water Green / yellow: brake oil in water content of less than 1%, better brake fluid performance, ease of use. Green / yellow / yellow: brake oil in water content of about 2%, 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 at least 4%, the brake fluid must be replaced immediately responsible for very dangerous. How to use: Step 1. Turn on the brake fluid tester by pressing the button. A green light should light up. If the light does not come on, it may be time to change a battery. Step 2. Unscrew the lid for the brake fluid reservoir, and take off the cap for the brake fluid tester. Step 3. Dip the test probes into the brake fluid and the LED lights will indicate the percentage of water in the brake fluid. Step 4. After testing, remember to screw the lid of the brake fluid reservoir back on tightly. Step 5. The tester will automatically power off after 12 seconds of inactivity. Package Included: 1 * Brake Fluid Tester(Not Battery Included)