Code Readers: These are basic diagnostic tools that can only read and clear diagnostic trouble codes. They are typically more affordable than full-function OBD2 scanners and do not provide advanced diagnostic capabilities.
OBD2 Scanners: These handheld devices plug into the OBD2 port of a vehicle (usually located under the dashboard) to read diagnostic trouble codes (DTCs), view real-time data from sensors, and perform basic diagnostic functions.
Multimeters: Multimeter tools measure voltage, resistance, and other electrical parameters in a vehicle's electrical system. They are used to diagnose issues related to electrical components such as sensors, switches, and wiring.