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<p>[QUOTE=&quot;ToughCOINS, post: 8099818, member: 20480&quot;]The principle employed by this type of equipment is the confirmation of material based on its inherent mass and stiffness for the thickness tested.&nbsp; It works great when samples are of uniform thickness, however the thickness can vary pretty meaningfully on struck coins for it to be considered accurate in that application.</p><p><br /></p><p>Still because materials substituted for PMs (tungsten for gold, as one example) diverge widely for relevant properties (while the densities of tungsten and gold are almost identical, the elastic modulus of tungsten is more than 5 times that of gold), it may still prove useful in confirming that the test subject is much closer to being one than the other.[/QUOTE]</p><p><br /></p>

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