Two signature pads have been tested for compatibility with both the TaxSlayer Pro desktop and ProWeb programs:
There are many other signature pad models made by Topaz and Scriptel as well as other manufacturers, but they haven't been tested for compatibility and so aren't guaranteed to work with either program. (This includes the Topaz SigLite T-S460-B-R serial port model with a USB adaptor, which will not work.)
Additional Information:
ProWeb: How to Set Up the Topaz Signature Pad
ProWeb: Scriptel Signature Pad