ELM 327: Small OBD2 adapters that connect to the car’s diagnostic port and convert the ECU data into a Bluetooth, Wi‑Fi, or USB signal. They connect wirelessly to mobile phones, tablets, and computers.
Standalone (With Screen): Standalone devices that include their own display (LCD, TFT, or touchscreen), without requiring the use of a smartphone, app, or computer to operate.
Professional: Professional OBD2 diagnostics offer comprehensive access to the vehicle’s systems, going beyond the simple reading and clearing of basic engine faults that amateur tools perform.