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<p>[QUOTE=&quot;-jeffB, post: 8600586, member: 27832&quot;]Four-wire measurement would be better, of course, but I&#039;m pretty sure it still wouldn&#039;t be good enough. I know <i>I</i> don&#039;t have the calculus chops to figure out what voltage drop I&#039;d expect across a chord of a solid disc with irregular thickness (the features on each face of the coin). And you&#039;d still need to stick the current-source contacts onto the coin hard enough to leave permanent marks. And deal with thermoelectric effects, and, and, and.</p><p><br /></p><p>Better to induce a current and measure its behavior, the way Sigma testers do. I&#039;m still not convinced I totally trust them, but I don&#039;t think any contact-based resistance tester can do better.[/QUOTE]</p><p><br /></p>

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