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Well they weren't kidding when they said that the RS meters aren't that accurate. I didn't think it would be that far off. That article needs to be stickied in the "Mic section".
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We continually tell people over and over and over again that the Radio Shack meter is not suitable for full range measurements.... (in fact, both myself and Ethan Winer informed you of that when you asked the same question in the Home Audio Acoustics section
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Sonnie and I didn't even consider trying to provide calibration data for Radio Shack meters above subwoofer range. They simply aren't consistent or accurate enough.
In fact, I question the results of the pdf file about the RS meters since the tests were using 'measurement data' to derive corrections at frequencies above subwoofer bandwidths. Doesn't seem accurate enough to even attempt. Even the smallest mic element positional differences where the response is changing rapidly would produce large error results. The capsules inside the tips of the meter would have to be placed exactly for each test. At higher frequencies it would be real tough to get accurate results.
brucek