12V test light with an indicator light for automotive electrical testing, enabling technicians to check electrical systems even in dark environments. Copper probe for good conductivity, providing accurate measurements that are reliable and durable in everyday use. Test light includes a voltage display and is compact and lightweight, easy to hold like a pen, giving you control and comfort during use. Widely used automotive tool for testing polarity of a voltage, continuity, lamp function, and electric motors, and for following and locating short circuits. Practical use scenarios: Underhood diagnostics in low light to verify wiring continuity and circuit integrity. Check polarity and voltage at battery terminals, fuses, and other components in the 12V system. Trace short circuits by following the current path and testing individual components to locate faults.