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<p>[QUOTE=&quot;Ce BCA, post: 4180625, member: 18716&quot;]The digital ones (that don&#039;t need liquid) have the same accuracy issues as the Presidium thermal meters, although they can be useful in the field for ruling out glass.</p><p><br /></p><p>Get one with a built in sodium light source and a CZ table (not glass), a good one will last a lifetime if you are careful with it.&nbsp; Decent ones in the UK are around £400 and up.&nbsp; The liquid they use is toxic, so read up on it before using.</p><p><br /></p><p>Edit: you have to be able to put the gem table flat on the meter surface, so they are no use if the setting is proud of the gem.&nbsp; Also the gem needs to have good polish, chips and scuffs can cause accuracy issues.[/QUOTE]</p><p><br /></p>

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