1、The brake fluid tester, with a high‑precision sensor, has accurate detection results, can effectively detect the state of the brake fluid, and provide you with a safer driving guarantee. 2、With a 3‑color LCD high‑resolution display, you can understand the details and test results more clearly. DOT3 indicates that the purity is less than 1%, DOT4 indicates that the state is less than 2%, and DOT5 indicates that the state is more than 4% and must be replaced. 3、There are anti-skid designs on both sides, which can be operated with one hand. The operation is simple, bringing you more convenience, supporting multi-fluid testing, and better meeting your needs. 4、Replaceable battery design, more convenient and faster to use, universal probe design, sturdy, corrosion‑resistant, and long service life。 5、With alarm sound design, when the moisture content of the brake fluid exceeds the standard, an alarm will be issued to replace the brake fluid. Condition: 100% Brand New Item Type: Brake Fluid Tester Material: ABS Color: Gray Size: Approx. 156 x 55 x 24mm/6.1 x 2.2 x  0.9in Operating Environment: -10℃-50℃ Power Supply Battery: 2 x AAA Battery (Not Included) Test Range: DOT3, DOT4, DOT5.1 Display: HD Backlit DisplayInstruction: How much do you know about brake fluid? All drivers know how important brake fluid is when driving. It is directly related to vehicle safety and personal safety, which is why many people describe brake fluid as a “safety guard”. The general brake fluid replacement cycle is 2 years. The brake fluid itself has strong water absorption and will absorb moisture in the surrounding air, such as car washing, damp air, etc. This will directly lead to the deterioration of the brake fluid quality and may lead to accidents. Rear accident, loss of vehicle control, traffic accident. Why is a brake fluid tester an essential tool? 1. What is brake fluid? Brake fluid is a type of hydraulic oil used in hydraulic brakes and hydraulic clutches of automobiles, motorcycles, light trucks and certain bicycles. 2. Take precautions and drive easily. After one year of use, the moisture content of the brake fluid will be higher. When the water content in the brake oil reaches a certain level, the braking force will be weakened and the braking distance will be extended. 1 x Brake Fluid Tester