• 【Multifunctional Testing Capabilities】Performs comprehensive electrical diagnostics including conductivity testing, voltage polarity detection, lamp inspection, motor checking, short-circuit tracking, and ground fault identification for complete automotive electrical system analysis.
• 【Extended 13-Foot Test Cable】Features approximately 4-meter long thickened test cables providing convenient access to test any electrical system component without limitation, ensuring flexibility during diagnostic procedures.
• 【Advanced Short Circuit Protection】Built-in overload protection automatically trips when current exceeds 8A, with immediate ground fault detection and buzzer alarm to prevent equipment damage and ensure operator safety.
• 【High-Definition LCD Display with LED Indicators】Blue backlit LCD screen displays precise voltage readings while red LED illuminates for positive polarity detection and green LED for negative polarity, providing clear visual feedback during testing.
• 【Integrated LED Flashlight】Unique lighting design with built-in LED at probe tip enables convenient nighttime maintenance and operation in low-light conditions for enhanced work efficiency.
• 【Wide Voltage Range Compatibility】Supports comprehensive DC 3.5-40V electrical system testing across various vehicles including cars, trucks, SUVs, motorcycles, construction vehicles, and marine applications.
• 【Simple One-Button Operation】Easy-to-use design with single power switch and auto-reset trip function allows technicians to quickly switch between positive and negative testing modes without complex setup.

Operation Instructions:

• Unfold the device's test cables
• Attach the red clamp to the vehicle battery's positive terminal
• Attach the black clamp to the vehicle battery's negative terminal
• Use the power switch to toggle between positive and negative current flow to the test probe