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<p>[QUOTE=&quot;desertgem, post: 3409726, member: 15199&quot;]My coin dealer friend has a Sigma and will test every piece of bullion or PM coin he suspects. and for his usual customers do them for free also as the machine is passive except for producing an ultrasonic beam and the reading part does require changes to be made to the machine depending on the type and such of the coin but seems to only adjust the reading range. I didn&#039;t work it myself, so not sure of all of the steps. Jim[/QUOTE]</p><p><br /></p>

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