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<p>[QUOTE=&quot;all_fakes, post: 189354, member: 55&quot;]Snap gauge might be one name; it appears the Mercer gauges could be used for almost anything where one might want to compare small distances.&nbsp;&nbsp; See</p><p><br /></p><p><a href="https://en.wikipedia.org/wiki/Indicator_(distance_amplifying_instrument)" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Indicator_(distance_amplifying_instrument)" rel="nofollow">https://en.wikipedia.org/wiki/Indicator_(distance_amplifying_instrument)</a></p><p><br /></p><p>for a general discussion of such things....I&#039;m sure OP knows all this already.[/QUOTE]</p><p><br /></p>

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