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<p>[QUOTE=&quot;Oldhoopster, post: 3654111, member: 84179&quot;]The guy said it is a calibrated scale where he works.&nbsp; We have a set up like this where I work.&nbsp; It&#039;s a 3 digit scale that is on a calibration schedule.&nbsp; The scale should be good, however, the repeatability of the test can be tricky, especially if the operator hasn&#039;t done many of these.&nbsp; The OP got range of 8.91-9.02 (hopefully he did more than 2 tests) and the spread might be from test variability.&nbsp; That&#039;s why I suggested he measure some copper Lincoln&#039;s as well as talk to a quality engineer.&nbsp; Many quality people have a solid statistical background and can help determine the right sample sizes and if there are statistically significant differences.</p><p><br /></p><p>As [USER=15199]@desertgem[/USER] pointed out, there are additional areas of variability present, so that&#039;s why you need to measure more than one piece and not rely on theoretical calculations, especially when the compositions are very similar[/QUOTE]</p><p><br /></p>

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