High Quality Reasonably Priced SPL Meter?

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There is the well known Software "REW" from Image Shack in US (free when registered).
It works perfectly with the USB-microphone UMIK-1  ( http://www.minidsp.com/products/acoustic...ent/umik-1 ), about 75$ or similar in €.
Calibration file can be downloaded by serial number.

Sound is send via PC or Laptop to the Devialet, no need for a soundcard or anything. Available for Mac and PC.

When I use REW with a UMIK microphone and always get a microphone volume level error messages.  Is the calibration file you mention used to correct specifically for the UMIK?  I can get nice graphs etc. from REW but have no confidence in the results due to the errors.  Maybe this is the answer?

I guess listener is referring to the calibration file that is associated with each individual UMIK-1 (by serial number). As I understand it, it's supposed to correct for variations from flat frequency response from one mic to the next. I don't think it will make a big difference to the overall volume level as perceived by REW (but I may be wrong!).