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<p>[QUOTE=&quot;-jeffB, post: 2785703, member: 27832&quot;]Have you ever tried this? You&#039;ll find that if you &quot;just touch&quot; the coin with the probes, you&#039;ll be touching surface contaminants (dirt, oil, oxides, sulfides). If you think you can distinguish silver from copper or nickel this way, you&#039;re kidding yourself.</p><p><br /></p><p>I just bought a fairly spiffy new meter (well, new old stock); I&#039;ll see if I can cobble together a demonstration. Maybe I can even put the coin on a scale -- a kitchen scale, not a coin scale -- to show how <i>hard you have to press</i> to get a <i>stable</i> reading. (And I say &quot;stable&quot;, not &quot;accurate&quot;, because I&#039;m pretty sure the actual resistance of the metal in the coin will be dwarfed by other effects.)[/QUOTE]</p><p><br /></p>

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