This versatile fourinone diagnostic tool combines the capabilities of a multimeter, test lamp, lighting lamp, and probe into one convenient device. Designed to go beyond the limitations of standard multimeters, it offers precise detection of wiring issues that typical tools may overlook, making it essential for accurate electrical troubleshooting. Key Benefits and Features: Detects wires with poor contact and aging insulation, helping prevent unexpected electrical failures. Combines four essential functions: multimeter, test lamp, lighting lamp, and probe, reducing the need for multiple tools. Effectively identifies line faults even when wires are covered by rubber insulation. Compact and easy to handle, allowing quick setup and simple operation without complicated adjustments. Reliable performance suitable for both professional technicians and DIY enthusiasts. Practical Applications: 1. Automotive electrical diagnostics: Test circuits, wiring, and components under various cover conditions to quickly locate faults in vehicles. 2. Home electrical maintenance: Identify faulty or aging wires in appliances, extension cords, and household electrical systems. 3. Workshop and field use: Perform onthespot testing for machinery wiring and equipment without removing protective insulation. Designed for efficiency, convenience, and accuracy, this tool allows users to detect faults quickly and with confidence. Its combined functions save time, space, and cost while delivering dependable results in a wide range of electrical testing scenarios.