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<p>[QUOTE=&quot;Bronwen, post: 324203, member: 5833&quot;]Googling &#039;glass standards set&#039; produces results that are mostly barely comprehensible to me, but overall I understand that these sets are used in the calibration of gizmos that analyze the molecular composition of things using light to do it.&nbsp; Here&#039;s a <a href="http://pubs.acs.org/doi/abs/10.1021/ac60371a785?journalCode=ancham" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://pubs.acs.org/doi/abs/10.1021/ac60371a785?journalCode=ancham" rel="nofollow">letter published in a technical journal </a>that you don&#039;t have to fully understand to get the gist.&nbsp; The thing most like it I have encountered in my own experience has been jewelers at trade shows who have a set of metal bars guaranteed to be 14K gold, or 925 silver, etc., to check on the accuracy of any electronic metal analysis machine they might be considering buying or to test out the competition.</p><p><br /></p><p>See I have been out-teched while typing.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie49" alt=":happy:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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