Use this tool for diagnosing electrical faults and CAN bus line activity. Check active protocol lines, or connect a multimeter or oscilloscope for detailed signal analysis. Useful Functions: Verify ECU activity, LEDs at pin-out display signal detection, Flashing LEDs for ECU activity, Monitoring of OBDII data lines, Probe lines with scope or multimeter for detailed signal information, Check and monitor battery voltage, Continuous numeric display or voltage. Product Features:Connects between Diagnostic Link Connector (DLC) and scan toolAlarm warning when voltage drops below 11.6v or rises above 15.2vConnect leads for increased diagnosis, analysis, and monitoringLEDs at pin-out display signal detection, Flashing LEDs for ECU activityCheck power and ground circuits