The device in the image is a V310 OBD2 car diagnostic tool, also known as a car code reader or scanner. It is used to diagnose issues in vehicles that are OBD II compliant, which generally includes cars made in 1996 and newer. Here's some helpful information:
Function: It reads and clears diagnostic trouble codes (DTCs) from a vehicle's computer system.
Compatibility: Works with most 1996 and newer OBD II-compliant vehicles.
Display: Shows current sensor data, including engine RPM and calculated load value.
User Interface: Features buttons for VIN/DTC, up/down navigation, return, and OK.
Purpose: Helps identify problems with the engine, transmission, ignition, brakes, and more.
Usage: Plugs into the OBD port, usually located under the steering wheel.
Codes: Displays OBD-II codes, which are categorized as P (powertrain)