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<p>[QUOTE=&quot;desertgem, post: 1792591, member: 15199&quot;]This source assumes a triple beam type of balance , which although readily available as surplus is not even commonly found in labs any more, and I would guess that 90% or more of numismatists have only electronic balances available. Here is a specific gravity &#039;kit&#039; which can be used with electronic balances, or a &#039;poorman&#039;s &#039;&nbsp; physical balance that is less costly, but both are very reasonable .</p><p><a href="http://www.mineralab.com/SpecificGravity/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.mineralab.com/SpecificGravity/" rel="nofollow">http://www.mineralab.com/SpecificGravity/</a>[/QUOTE]</p><p><br /></p>

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