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

This vehicle electrical system circuit tester is a must-have tool for automotive maintenance, designed to simplify diagnostic processes and reduce repair time. Compatible with 6-30V vehicle electrical systems, it meets the needs of both professional technicians and DIY enthusiasts.With 4 practical working modes, this tool covers all essential electrical tests: DC Voltage mode for precise voltage and polarity detection (0.1V resolution), AC Voltage mode for measuring max/min voltage, frequency and duty cycle, Resistance mode for continuity checks (0-200KΩ range), and Tone mode with adjustable audio prompts for use in various lighting conditions.The intuitive design makes operation straightforward—red LED lights up for positive circuits, green LED for negative circuits, and the clear LCD display shows real-time test data. The built-in circuit breaker provides automatic overload and short circuit protection, ensuring safe use without damaging the tool or vehicle components. The included auxiliary ground lead and long cable allow for flexible testing across the entire vehicle, eliminating the need for constant search for suitable grounds

• Multi-Functional Diagnostic Modes：Features 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 Design：Equipped 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 Range：Compatible with 6-30V vehicle electrical systems, ideal for testing voltage/polarity, continuity, sensor circuits, trailer lights, ground contacts, and locating short circuits—saves time on troubleshooting
• Safe & Durable：Built-in automatic short circuit protection (internal circuit breaker) prevents tool damage from overload; operates in -40°C to 70°C storage temperature, with oil/water/grease-resistant housing for long-term use
• Convenient Operation：Powered 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