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<p>[QUOTE=&quot;Bacchus, post: 9442059, member: 759&quot;]Still thinking about this, the measurement of resistivity makes the comparison process simpler.&nbsp; That means all bars/coins of the same base metal should have the same reading, regardless of size/shape.</p><p><br /></p><p>I looked up resistivity values at</p><p><br /></p><p><a href="https://www.thoughtco.com/table-of-electrical-resistivity-conductivity-608499" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.thoughtco.com/table-of-electrical-resistivity-conductivity-608499" rel="nofollow">https://www.thoughtco.com/table-of-electrical-resistivity-conductivity-608499</a></p><p><br /></p><p>And it shows silver with a value of 1.59x10^(-8) Ω-m.&nbsp; My readings for bars and ASEs were 1.60 and 1.66.&nbsp; Good News:&nbsp; My readings are almost exactly the same as the resistivity value; and Bad News:&nbsp; the linked table resistivity value isn’t 1.59 micro Ω-m, it is 15.9 nano Ω-m.</p><p><br /></p><p>So assuming the PMV’s “measurements” represent 10 nΩ-m, my readings are “1.60” = 16.0 nΩ-m and “1.66” = 16.6 nΩ-m, compared to the expected value of 1.59x10^(-8) = 15.9 nΩ-m. </p><p><br /></p><p>Sounds good.&nbsp; Am I doing this right?&nbsp; I’m old and retired, and I had a big dinner tonight, I might be a little fuzzy.</p><p><br /></p><p>Now looking at my gold measurements.&nbsp; Bars were “2.2” and AGEs were “8.0”.&nbsp; &nbsp; “2.2” = 22 nΩ-m compared to the expected value of 2.44x10^(-8) = 24.4 nΩ-m.&nbsp; That seems good, 22 compared to 24.4.</p><p><br /></p><p>My AGEs are not so good:&nbsp; “8.0” = 80&nbsp; nΩ-m.&nbsp; That’s way off from the expected value of 24.4 nΩ-m.&nbsp; &nbsp; According to the Table of Resistivity they’re more likely made of nickel.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />. Of course, the AGEs are only 22K, but the other 2K consists of silver and copper, both of which have lower resistivity than gold, which I would think would give me a resistivity even lower than gold.</p><p><br /></p><p>More likely yet, the PMV isn’t measuring these small coins correctly in their air-times. I’ll go back and measure one out of its case and experiment between measuring with the PMV “main” sensor and the wands.&nbsp; The wands are intended, I believe, for small samples.[/QUOTE]</p><p><br /></p>

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