Features: The brake fluid tester can test the quality of car brake oil so that you can know for sure if the brake oil is in good performance and replace it in time. Small size design makes it convenient for you to carry and use, the unique grip design can avoid hand slip, perfect hand-feeling. Four LED lights show the quality condition of the brake oil. Two green LED lights up for good quality, the yellow LED lights up for bad quality, and the red LED lights up indicates that the brake oil is deteriorated and must be replaced for safety driving. Fits for most vehicles. It can test DOT-3, DOT-4, DOT-5 brake fluid. A money-saving and time-saving product on testing and replacing brake oil. One 9V(6F22) battery is needed at the back of the tester(battery not included). Specifications: Voltage: 9V Battery Model: 9V(6F22) Material: Plastic Color: Multicolor Weight: 18.5*10.6*4.5cm/7.3*4.2*1.8in Size: 198g/7oz Package List: 1*Automotive Brake Fluid Tester 1*User manual (in English) Battery not included