High Quality Performance: The brake fluid detector uses nickel plated metal probe, oil and oxidation resistant, not easy to corrosion. The case is matte black plastic for better skid resistance and good body texture. Metrics are accurate to 1% and results are received within seconds. Help you understand the brake fluid more clearly. Safe Driving: This product can quickly check the health condition of your car brake fluid and remind you to change the brake fluid when necessary to avoid traffic accidents, so that you are more comfortable and safer. Easy Operation: Brake fluid detector is easy to use, and small size easy to carry. Press the button, insert the test pen, it only takes a few seconds to know the result through the LED, in order to save power, this test pen has automatic shutdown function. It will automatically turn off the power after 20 seconds each time to save power. Wide Application Range: can be used in most cars. It is suitable for detecting the moisture content in DOT-3, DOT-4, DOT-5.1 brake fluid. It is very convenient for personal use and widely used in individual workshops, repair shops and dealer workshops. Service Guarantee: The brake fluid detector requires 1 LR03 AAA 1.5V battery. Our package does not include batteries, please buy batteries at local market. We offer a one-year warranty. If you cannot confirm its compatibility, or have any questions, please feel free to contact us.