Latest  CAT ET 3 III WIFI Communication CAT Adapter 3 P/N 317-7485 CAT3 Professional Heavy Duty Truck Diagnostic Tool New Available! Caterpillar CommuniCATion Adapter 3 is the latest generation of the Communication Adapter group, and replaces the Comm Adapter II. This is the only recommended communication device for et 3,and the... Read more »