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<p>[QUOTE=&quot;LostDutchman, post: 1867212, member: 16994&quot;]This has been my trepidation in getting one. I have gotten to play with one of the $15k+ guns and as far as I can tell they only test the surface. The acid is far less accurate in determining actual karat... But because you do rub it on a wet stone you actually get a sub surface test.</p><p>The gun I saw in use was having a problem differentiating between 10k and 10k gold filled and the operator asked me to do an acid test to be sure...</p><p><br /></p><p>The real x ray assay machines will sit on a large table and run about $50,000.[/QUOTE]</p><p><br /></p>

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