Features: 1.Check the water content of the brake fluid, with 5 level brake fluid status, support DOT3, DOT4, DOT5.1 brake fluid. 2.With high?accuracy sensor and universal probe, it can ensure fast, stable and accurate test, reliable to use. 3.Bright LCD display allows you to know the detailed information more clearly, and the test results are easy to understand. 4.Including 4pcs replaceable AAA batteries, long battery life, can be used for a long time. 5.Simple operation, can be operated with one hand, non?slip design on both sides, humanized design, easy to hold. Specification: Item Type: Brake Fluid Tester_x000D_ Material: ABS_x000D_ Support Oil Type: DOT3, DOT4, DOT5.1_x000D_ Oil State Test:_x000D_ Water content is less than 1% normal_x000D_ Note that the water content is less than 3%_x000D_ If the water content is greater than 3%, please replace the brake fluid_x000D_ Backlight Display: Support_x000D_ Alarm Reminder: Support_x000D_ Automatic Shutdown: Automatic shutdown within 6 minutes of no operation_x000D_ Power Supply: 4 x AAA batteries (included)_x000D_ Applicable Temperature: -10C-50C_x000D_ Metal Probe: Approx. 190mm/7.5in_x000D_ _x000D_ Description:_x000D_ The general brake fluid replacement cycle is 2 years. Brake fluid itself has strong water absorption characteristics, it will absorb moisture in the surrounding air, such as car washing, humid air, etc., which will directly lead to the deterioration of brake fluid quality, and may lead to accidents:_x000D_ 1. Rear-end collision_x000D_ 2. Brake failure_x000D_ 3. The vehicle is out of control_x000D_ 4. Traffic accident. PackageList: 1 x Brake Fluid Tester 4 x Batteries 1 x Manual 1 x Storage Box