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<p>[QUOTE=&quot;-jeffB, post: 1360843, member: 27832&quot;]Yeah, a multimeter won&#039;t do much -- you need to measure really tiny levels of resistance, and contact resistance (largely determined by dirt on the surfaces) far outweighs the resistance of the metal itself. You&#039;ve got to either couple inductively, which is pretty complicated (and is what metal detectors do), or dig into the metal with a sharp probe. Of course, you can only do that to the end coins, and you trash them if you do.</p><p><br /></p><p>It&#039;s been a long, long time since I studied electronics (it was well before the Web), but I know Forrest M. Mims had some really good intro books that were sold through Radio Shack, and I think they&#039;re still available there; that&#039;s how I got started, and I highly recommend them. When you get more advanced, <a href="http://en.wikipedia.org/wiki/The_Art_of_Electronics" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/The_Art_of_Electronics" rel="nofollow"><i>The Art of Electronics</i></a> is a one-book university.[/QUOTE]</p><p><br /></p>

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