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Message:: [QUOTE="Bacchus, post: 10358419, member: 759"]The AGEs test just fine (i.e., they pass) with the PMV in its pass/fail mode.  That tells me that when selecting a PMV p/f mode to test a coin, the difference in resistivity is factored in to the p/f test result (of course), and the differences are big enough to require different metal selections.  The PMV has gold and silver metal selection options as follows. For gold: 99.9%91.7%.  (22K AGEs, for example)90%American Eagle (22K again)Krugerrand98.6%Britannia 1990-2012 For silver: 99.99%99.9%92.5%90% US pre 190090% US pre 194590% Coin 196096% Britannia80% Canadian Interesting about the pre 1900 and pre 1945 90% silver coins.  Maybe the pre 1900 coins had a different 10% makeup than the pre 1945? But I can see the need for the different metal selections if 24K gold has a resistivity mantissa of 2.44 and 22K AGEs are about 7.70.  There is no way that each would sneak in under the limits and pass a test designed for the other. I think I’m done.  I returned all borrowed gold and silver used for these tests.  Thank you jeffB for nudging me in the right direction with your pointers on resistivity.[/QUOTE]