I bought two GT-521F52 devices, I received them and they are working properly. One thing that bugged me is that on the back of the first device I can see a white label which says "GT-521F52", while on the back of the second device there isn't a label, there is just some text printed directly on the board, which says "GTM-5210F12-P1V1".
Now, if you go to the sparkfun website and search these two models, you'll see that the F52 board has the white label on the back, while the F32 board has the exact text I pasted printed directly on the board.
I'd like to know which products they are, so I thought of querying the maximum number of fingerprints they can hold, as the F52 can hold 3000 FP while the F32 can hold just 200, but it seems there is no direct way to ask the sensor for that information with the arduino library (https://github.com/sparkfun/Fingerprint_Scanner-TTL).
So, my question is: is there a surefire way to identify which products they are?