This car brake fluid moisture detector provides quick, ataglance readings using 5 LED indicators for easy interpretation. It is designed to be fast, accurate, and user friendly. Key features Clear readings: 5 LED indicators show moisture level at a glance, eliminating guesswork. Broad compatibility: Tests DOT3, DOT4, and DOT5.1 brake fluids with fast and reliable results. Portable design: Small, lightweight testing pen that fits easily in a pocket or tool bag for convenient transport and storage. Versatile use: Suitable for home use, car shops, and various automotive service environments. What makes it stand out Simple operation with a straightforward LED readout, reducing the need for complex instruments. Compact, portable form factor that supports quick checks in different settings without adding bulk to your toolkit. Reliable compatibility across common brake fluid types to support routine maintenance and diagnostics. Suitable places to use Home maintenance: Check brake fluid moisture before long trips or after fluid replacement to decide if service is needed. Car workflow: Quick moisture screening during brake system maintenance to help determine fluid condition. Mobile or small workshop use: Carry the tester for onsite checks in garages, fleets, or roadside service scenarios. 23 practical use scenarios Before a scheduled long drive, test the brake fluid moisture to assess whether a replacement is warranted, helping prevent brake performance issues. During brake fluid service in a , use the tester to confirm fluid quality across DOT3/4/5.1 types, ensuring safe operation after maintenance. In a mobile setting, keep the device on hand to perform rapid fluid moisture checks for customers, enabling informed maintenance decisions without delays.