With all due respect to Chris for finding the meter at The Source...
I have both meters. I bought the Scosche at Wal-Mart because it was a good deal there. However, I ended up buying the Radio Shack meter afterwards and though the cost was 2x more, I don't regret it. It is still a great value.
Here are reasons why you might might want to consider the Radio Shack meter.
- it does both A-weighting and C-weighting.
- it has an external mic output (RCA) that you can easily patch into a soundcard.
- calibration data is available for it which works with REW (Room EQ Wizard) a free java room tuning app from HomeTheatreShack.com . This app has views for impulse, spectral decay, waterfall, RT-60, Energy-Time and more. You just need the meter, a soundcard, and java runtime on your computer.
- it can be mounted on top of a mic stand using a small thread adapter.