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<p>[QUOTE=&quot;desertgem, post: 3911991, member: 15199&quot;]If you are worried about titanium, you use an ultrasound velocity /thickness device&nbsp; as the velocity of ultrasound through gold is 3200 and titanium is 6100 meters/sec. A cheap ultrasonic depth meter on Amazon can be under a few hundred. The biggest problem is a gold coin is not completely flat with the devices, so a transducer fluid has to touch the device and your coin. Mineral oil works with mine, and I clean it off with acetone. Silver by the way has a transmission of 3600, copper 2800.&nbsp; Jim</p><p><br /></p><p>one like this </p><p><a href="https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&amp;psc=1&amp;refRID=2WZ2SZY6ZN7C21WF1TXT" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&amp;psc=1&amp;refRID=2WZ2SZY6ZN7C21WF1TXT" rel="nofollow">https://www.amazon.com/Ultrasonic-Thickness-Digital-1-2-220mm-Storage/dp/B07QGZ94D3/ref=zg_bs_401603011_17?_encoding=UTF8&amp;psc=1&amp;refRID=2WZ2SZY6ZN7C21WF1TXT</a>[/QUOTE]</p><p><br /></p>

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