precise tests 5 LED lights display the percentage of the content in the brake fluid, providing precise and reliable test results. Easy to use Portable and lightweight with a cable design, it is easy to carry and use for automotive professionals in workshops. Multifunctional and compatible Determines brake fluid quality and content based on electrical conductivity and is suitable for DOT3, DOT4, and DOT5 fluids. Protects your car Helps prevent braking failure by showing brake fluid values and supporting performance and safety. Use scenarios Preservice brake maintenance: check the brake fluid moisture/content level before replacing fluid to decide if a flush is needed. Vehicle inspection: quickly verify compatibility and condition when confirming DOT3, DOT4, or DOT5 suitability during service. Fleet and DIY checks: screen multiple vehicles for brake fluid health before long trips or routine maintenance to ensure safe braking performance.