The main function: 1. BF200 supports DOT3, DOT4, DOT5.1 2. BF200 features a high precision sensor 3. BF200 supports multiple types of fluid testing 4. BF200 has a replaceable battery design 5. BF200 offers safe, fast, portable, easy, reliable, and accurate operation 6. BF200 includes a screen Features Attention please: The package does not include a battery; please purchase batteries locally. Why is a Brake Fluid Tester an essential tool? 1. What is brake fluid? Brake fluid is a type of hydraulic fluid used in hydraulic brake and hydraulic clutch applications in automobiles, motorcycles, light trucks, and some bicycles. 2. Take precautions and drive with peace of mind. After one year of use, the water content in brake fluid can reach a higher level. When moisture reaches a certain level, braking performance may be reduced and stopping distance may increase. Advantages of BF200 1. Sound alarm When the moisture content in brake fluid exceeds the recommended level, an alarm will sound to indicate it should be replaced. 2. LCD display shows test results indicating the quality of the brake fluid. For DOT3: below 1% High purity For DOT4: below 2% Acceptable status For DOT5.1: above 4% Requires replacement 3. High-resolution screen Displays clear test results in both low-light and bright daylight conditions. Color: Black & grey Material: ABS Size: 6.14 x 2.17 x 0.9 inches Package Contents: 1 x Car brake fluid detector tester 1 x Manual Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3 cm.