The Pro version is the same as the free version but, without the advertisements.

This handy little app does ONE thing. It lets you look up Error Codes for Gilbarco, Tokheim, and Dresser-Wayne fuel pumps and dispensers. If you are a service technician, or a station owner, you can use this to help diagnose a dispenser that is in an error code.
Just select the dispenser type then enter the error code from the dispenser. Click LOOKUP and if an error code is found it will be displayed. No more digging through a service manual to find obscure error codes.

Version 3.0 adds the ability to automatically check for Service Code updates.
About once a month Pump Codes PRO will check for an update file automatically.