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<p>[QUOTE="Oldhoopster, post: 3079524, member: 84179"]Voids and porosity in a bar like this can give erroneous readings on a resistivity tester. </p><p><br /></p><p>In addition, the Sigma Metalytics tester needs to be internally calibrated to the specific alloy you want to check. Should be straightforward for .999 bullion, but you need to understand a little of the science behind the equipment if you want to use it on something different. Sigma even notes in their literature that coins like Franklin halves may measure slightly out range for 90% silver because of compositional variations in the remaining 10% of the alloy.</p><p><br /></p><p>Tools like a resistivity meter and handheld XRD units are great, IF the user understands how it works and its limitations.[/QUOTE]</p><p><br /></p>
[QUOTE="Oldhoopster, post: 3079524, member: 84179"]Voids and porosity in a bar like this can give erroneous readings on a resistivity tester. In addition, the Sigma Metalytics tester needs to be internally calibrated to the specific alloy you want to check. Should be straightforward for .999 bullion, but you need to understand a little of the science behind the equipment if you want to use it on something different. Sigma even notes in their literature that coins like Franklin halves may measure slightly out range for 90% silver because of compositional variations in the remaining 10% of the alloy. Tools like a resistivity meter and handheld XRD units are great, IF the user understands how it works and its limitations.[/QUOTE]
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