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RE: A-B testing?

Hi Dave,
we made comparisons with 40, 60 and 80 khz machines in a laboratory. We cut a shaded dog into 3 parts and checked the results with a professional microscope. The result? The part of the record cleaned with a 40 khz machine was o.k., but there was some visible dirt left. With the 60 khz machine nearly all of the dirt was gone. But the winner was the 80 khz machine, we couldn't see any dirt at all.
Unfortunately 80 khz machines are not that common and if you find one they are expensive.
Uwe from Belgium

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