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<p>[QUOTE=&quot;cladking, post: 925693, member: 68&quot;]You usually don&#039;t need any magnification to grade.&nbsp; There are many exceptions like looking for hairlines or grading MS-70&#039;s.&nbsp; Sometinmes it&#039;s difficult to tell what&#039;s going on with the surfaces and you need some magnification to tell (nrormally 5 - 7x).&nbsp; Sometimes there are characteristics that are too small or too fine to discern so you need magnification.&nbsp; On very rare occassion you&#039;ll even find that 5 power isn&#039;t enough and you&#039;ll need more.&nbsp; </p><p><br /></p><p>Generally speaking high power is used only for attribution or authentication.&nbsp; It is imperative for new varieties and unknown issues.[/QUOTE]</p><p><br /></p>

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