Overview： A professional 12 V/24 V circuit-test and signal-access tool for diagnostics, development, and bench testing. It exposes every OBD-II pin, monitors live voltages (true RMS), provides optional CAN termination, and supports safe, fast hookup of other diagnostic/programming devices. Features： 1.12 V / 24 V Compatible Circuit Tester: Robust design for passenger cars and commercial vehicles. 2.Real-time OBD-II Pin Voltage Monitor (VRMS / true RMS): Power/ground integrity: e.g., pin 16 (+B) and pins 4/5 (grounds). Bus activity on CAN / K-Line: checks whether static/dynamic levels look reasonable; a green background indicates dynamic values. Pin assignment sanity-check: quickly validates expected wiring on retrofits or suspect harnesses—replacing basic VPP voltage checks. 3.120 Ω CAN Termination Switches: Inserts a 120 Ω resistor across the CAN pair to compensate for missing termination during single-ECU or small bench networks, improving signal integrity and reducing reflections. HS-CAN: pins 6 ↔ 14 (standard). OEM/MS-CAN (if present): pins 3 ↔ 11 (vehicle-dependent). Use termination only for bench/missing-terminator scenarios; keep OFF during normal vehicle use to avoid over-termination. 4.Bench Testing Support: Provides convenient connectivity for IGN/START activation or external wake-up tools so ECUs can be powered and exercised on the bench. 5.Signal Status: Pin background flashing green = dynamic signal. 6.High/Low Voltage Audible Alarms: Low-voltage (slow beep): 12 V systems: 15.5 V 24 V systems: > 31 V 7.Ground Status Indication: Pins 4 or 5 show OPEN when no ground is detected, and GND when a valid ground is present. 8.Quick Jumper Function (Technician Use Only): Allows a trained technician to momentarily bridge selected OBD pins via current-limited paths for OEM-approved procedures (e.g., make-specific communication or synchronization tasks). 9.Battery Replacement Memory Saver: Maintains vehicle power (12 V/24 V) during battery changes so vehicle settings are preserved. 10.Convenient Connectivity 150 cm/59inch extension lead for rapid hookup to other diagnostic/programming tools. External power input: 9–32 V DC, barrel 5.5 × 2.1 mm. Select 12 V or 24 V to match the vehicle battery or the module under test. Important Safety Notes: For professional use. Incorrect pin bridging or inappropriate termination can damage ECUs or wiring. Pins 3/11 are OEM-defined; only use the MS-CAN terminator when the vehicle actually implements CAN on these pins. The real-time voltage view is a quick health check and does not replace an oscilloscope for waveform analysis.