12V Vehicle Electrical System Circuit Tester - 4-in-1 Multimeter for Voltage, Polarity, Continuity & Short Circuit Detection, Auto Diagnostic Tool with LCD Display

Multi-Functional Diagnostic ModesFeatures 4 core working modes (DC Voltage, AC Voltage, Resistance, Tone) to cover all basic vehicle electrical tests, helping quickly identify circuit issues without switching tools | Easy-to-Use DesignEquipped with red/green polarity LEDs, clear LCD display (160*128 dpi), and audio tone prompt, allowing you to read test results (voltage, resistance, frequency) at a glance even in dark or bright work areas | Wide Application RangeCompatible with 6-30V vehicle electrical systems, ideal for testing voltage/polarity, continuity, sensor circuits, trailer lights, ground contacts, and locating short circuitssaves time on troubleshooting | Safe & DurableBuilt-in automatic short circuit protection (internal circuit breaker) prevents tool damage from overload; operates in -40C to 70C storage temperature, with oil/water/grease-resistant housing for long-term use | Convenient OperationPowered directly via vehicle battery, comes with auxiliary ground lead and long cable for testing along the entire vehicle length; no jumper wires needed to activate electrical components