There is PC-based software that will let you take measurements like that via a microphone connected to a sound card. RoomEQ Wizard is the example that immediately comes to mind (largely because it is free and reasonably powerful, and thus widely used), but there are others. The problem that you might run into is getting an accurate microphone calibration file for the SMS-1's mic. Most RoomEQ Wizard users are using sound meters like the Radio Shack models, so there's easy access to files for those, but I don't know how readily-available the SMS-1's mic file would be...