ELM327 is the latest PC-based scan tool. It is dispatched with a number of compatible programs. The processor is an ELM327. The output protocol (connection to laptop) is USB. ELM327 USB V1.5 OBD2 Car Diagnostic Scanner ELM 327 V 1.5 OBD 2 OBDII Interface PC-Based Auto Diagnostic-Tool OBD-II Scan.