Carscanner Pro is a professional version of the Car Scanner app, which is a mobile diagnostic tool that connects to a vehicle’s OBD-II (On-Board Diagnostics) system via a compatible adapter. It allows users to read and clear diagnostic trouble codes, monitor real-time sensor data, perform emissions checks, and view detailed information about vehicle systems. The "Pro" version typically offers additional features, such as more advanced data logging, customization options, and access to extended diagnostic parameters.