Can anyone help me figure out a way to figure out my ring size? I'd like to order a PK ring (on a side note...I know what the rings do..but I'm not yet sure what PK itself means) but don't know which to get.
First off I don't currently wear any other rings

Should I just head to a jewelry shop somewhere in town here? Or does anyoone know a way I could measure the diameter of my fingers in mm in order to order a ring?
Cheers,
Kev