Monitors car battery voltage and parasitic current draw for accurate diagnostics. Connects via 16-pin OBDII connector to supply 12V power and prevent data loss during battery replacement. Graphing mode displays voltage and amperage as a waveform, allowing in-depth electrical system analysis. Rechargeable high-capacity lithium-ion battery with USB-C charging and multi-color TFT display. Adjustable current output alarm and auto power-off settings to protect the vehicle's electrical system. View and record real-time data via Bluetooth on the Power Probe Link app for enhanced performance tracking.