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<p>[QUOTE=&quot;dougsmit, post: 2712446, member: 19463&quot;]I have a set of metal calipers I used in science classes long ago but a plastic mm ruler is more than enough for coin diameters.&nbsp; When I collected early stamps and was interested in fine measurements for position plating I photographed a very accurate metal mm scale on litho film at a very precise 1:10 ratio giving me a good scale that could be overlaid on a stamp and give good results.&nbsp; I still see no need for measurements that fine on coins because of the extreme variance you get from coin to coin.&nbsp; Overheated die expansion would even make measurements across a diameter enough that he last digit would not be significant.</p><p><br /></p><p>Vernier calipers work like this:</p><p><a href="https://en.wikipedia.org/wiki/Vernier_scale" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Vernier_scale" rel="nofollow">https://en.wikipedia.org/wiki/Vernier_scale</a></p><p><img src="https://en.wikipedia.org/wiki/Vernier_scale#/media/File:Vernier_scale_Direct_vernier.gif" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>I guess CT s/w won&#039;t allow moving in a gif?[/QUOTE]</p><p><br /></p>

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