Features: Quick Detection: The brake fluid tester can quickly measure the water content in the brake fluid to determine whether the brake fluid needs to be replaced. Universal Fit for DOT3/DOT4/DOT5.1 Brake Fluid Detection: The brake fluid tester can support 3 brake oil type detection and detect DOT3/DOT4/DOT5.1 brake fluid. LCD Display: The brake fluid tester is equipped with an LCD screen, which can intuitively and clearly display the percentage of brake fluid water content, allowing you to view the test results at a glance. It is also equipped with a backlit button. One key to open, no matter how dark it is, you can read the data clearly. Sound Alarm: When the water content is over 3%, the brake fluid tester will emit an alarm to remind you to change the brake fluid immediately to ensure safety. 235mm Flexible Probe: The brake fluid tester is equipped with a 235mm metal probe, which can be bent at will, allowing easy access and flexible testing even in hard-to-reach areas. Specifications: Item Name: LCD Display Digital Brake Fluid Tester Main Material: Plastic, Metal Power Supply: 4 * AAA Battery (Included) Color: Blue Size: 16*4.5*3.3cm Weight: 150g Package Information: Package Size: 240*220*55mm Package Weight: 500g Package List: 1 * Digital Brake Fluid Tester 4 * AAA Battery 1 * Storage Case 1 * Product Qualification 1 * Manual