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<p>[QUOTE=&quot;desertgem, post: 3225571, member: 15199&quot;]It could work to an extent. Many commercial testers works on comparison of ampitude/frequency with a chart or a recording of previous tests, but they use a carefully standardized generated tone and test the response with internal charts. When you generated a tone by tapping the coin, the sound produced will be dependent on the material tapped ( should be hard) and the coin, which should be in free fall. I do not like to drop my coins on a hard surface with a force to generate sound well.&nbsp; With bullion, fine, but with collectors or ancient coins, no. If you are going to drop bullion coins, just use jeweler&#039;s acids, more accurate. Its a cheap app and the developer seems to support it, so you could play with it. If you have a frequency generator and oscilloscope, you can rig audio equipment to do such. But I have to say, I have not had the urge to do so <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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