Description
TopDiag • Automotive circuit system tester P100
The TopDiag P100 is a precision diagnostic probe designed for professionals who work on both 12-volt and 24-volt vehicle electrical systems. Featuring a vibrant TFT color display (160×128 dpi) and rugged ABS plastic build, it enables voltage, resistance, polarity, and continuity testing with high accuracy. It also includes a power switch to activate components directly without jumper wires—ideal in workshops, garages, and mobile service settings. Specification ranges cover 0-65V DC, 0-200KΩ resistance, and built-in over-load and short-circuit protection for safe operation. Dimensions are 165mm × 40mm × 27mm; it operates between 0-60 °C and stores between -40-70 °C.
Key benefits
- Broad voltage compatibility: supports both 12V & 24V vehicle systems with 0-65V range
- Multi-mode testing: DC & AC voltage (including frequency and duty cycle), resistance/continuity, polarity detection
- Component activation without jumper wires for quicker diagnostics
- Robust safety: circuit breaker protection, reverse-polarity and over-voltage safeguarding
- Clear indicators: red/green LEDs for polarity, tone for open or closed circuits
- Portable and readable: large TFT color screen and built-in LED lights for low-light environments
Supported protocols
- DC voltage measurement
- AC voltage measurement (frequency & duty cycle)
- Resistance / continuity testing
- Diode testing
- Polarity detection
- Component activation output
Supported functions
Depending on vehicle compatibility the following functions are supported:
- Quick voltage & polarity checks on vehicle circuits
- Locate shorts and open circuits without removing wiring harnesses
- Test ground contact quality and poor ground faults
- Activate lights, relays, sensors, motors for functional confirmation
- Test trailer connectors and external lighting via extended cable reach
Included items
- 1 × TopDiag P100 main unit including probe tip
- 1 × battery hookup alligator clips (red & black)
- 1 × extension cable (available in 2-meter or 10-meter length)
- 1 × cigarette lighter adapter
- 1 × user manual
Supported languages
English, German, French, Spanish, Italian, Portuguese, Russian










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