Features: 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.  Buzzing and red light double alarm system for more accurate testing and higher cost performance.  Universal fit for most vehicle. High precision to test DOT-3, DOT-4, DOT-5 brake fluid.  Made from premium quality material, this detector is resistant to oils and oxidation.  Hand-held size provide one hand operation experience.  This professional tool will help you save your time and money on testing and repairing your vehicle.   Specifications: Material: Plastic;  Power supplys: 9V(6F22) battery (included);  Package Size: 24 x 14 x 5.5cm;  Package Weight: 220g;   Package List: 1 x Brake Fluid Tester;  1 x User Manual;  1 x Battery