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<p>[QUOTE=&quot;johnno92, post: 2056135, member: 46014&quot;]There are also apps (I use an Android phone; don&#039;t know if available for iPhone) for that too called &quot;Spectrum Analyze&quot;, &quot;Spectrum Analyzer&quot; and one made specifically for coins &amp; rounds called &quot;Bullion Test&quot;.&nbsp; I prefer the first one mentioned, which works great if you know what frequency you are looking for (and it&#039;s free).&nbsp; It will show the frequency and its harmonics as well. It does a peak (max hold) function which takes a snapshot of the peak frequencies.&nbsp; It&#039;s pretty cool for electrical engineering nerds like me.[/QUOTE]</p><p><br /></p>

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