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<p>[QUOTE=&quot;Ce BCA, post: 4255711, member: 18716&quot;]If you get one you will be disappointed, go and read the professional gemologists forums and see what they say about it.&nbsp; Any slight scratch, flaw or dust will throw off your readings.&nbsp; Repeatability is poor, ie you get different readings each time you put the same stone on.&nbsp; Also look at their videos, they have perfectly polished stones to work with.&nbsp; Presidium II is useful as it works well in the field to give you an idea then you can check at base with more accurate kit.[/QUOTE]</p><p><br /></p>

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