Label Format 1
You can confirm the GP revision with the label affixed to the GP unit. In the below example, an asterisk "*" is on the position of "4", therefore, the revision number is "Rev.4".

Label Format 2

PV: Product Version
RL: Revision Level
SV: Software Version
The PV and SV numbers can assist in answering technical questions by::
Managing compatibility issues in case of product exchange.
Associating a list of known problems to the product version.
Help Customer Service to identify the sites product technical state.
The RL number is used internally to track product revisions. Therefore, some products do not have RL listed.
Please note that the SV version number identifies the software version as the module was shipped.
The modules may be field upgraded to current revisions.