What type of gem refractometer?

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qianshouken
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Joined:Thu Jun 16, 2022 1:59 am

Thu Jun 16, 2022 3:21 am  

hi,im looking for a gem refractometer to complete test 4,and ive noticed there are different kinds.Which one do we need?Ie theres analogue ones,digital ones,handheld ones,are they all the same?

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