- Versatile 6 V to 24 V DC diagnostic tool: suitable for diagnosis in all 6 V to 24 V DC electrical systems. It can check switches, relays and the on/off states of diodes, fuses and circuits, helping shorten diagnostic time in electrical vehicle systems. - Clear polarity indication: easily identify positive and negative polarity of vehicle cables and connectors. When the probe tip touches the positive electrode, the red light lights up; when it touches the negative electrode, the green light lights up. - Simple, hands-on operation: clamp the red clip to the positive pole of the vehicle battery and the black clip to the negative pole. After connecting the tracer to the battery, tilt the power switch forward or backward to direct a positive or negative current to the tip. - Convenient testing setup: includes about 4 m of cable, reducing distance constraints during use and enabling easier testing in tight spaces or with longer wiring runs. Use scenarios: - Automotive diagnostics: quickly verify relay operation and fuse status in ignition, lighting, or other vehicle circuits. - Wiring and installation: confirm polarity and power flow before wiring aftermarket accessories or repairing dead circuits. - Electrical system checks: test diodes and switches in DC circuits within cars, electric vehicles, or other 6–24 V systems.