Feature: 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 Material: ABS Support Oil Type: DOT3, DOT4, DOT5.1 Oil State Test: Water content is less than 1% normal Note that the water content is less than 3% If the water content is greater than 3%, please replace the brake fluid Backlight Display: Support Alarm Reminder: Support Automatic Shutdown: Automatic shutdown within 6 minutes of no operation Power Supply: 4 x AAA batteries (included) Applicable Temperature: -10°C-50°C Metal Probe: Approx. 190mm/7.5in Description: 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: 1. Rear-end collision 2. Brake failure 3. The vehicle is out of control 4. Traffic accident.. Package List: 1 x Brake Fluid Tester4 x Batteries1 x Manual1 x Storage Box