Refractometer Tutorial - 搜索视频

$How to use a refractometer for beginners / quick Gemology tutorial$

This is a refractometer, one of the key tools in gemology. It uses light, a polarising filter, and a tiny drop of refractive liquid to measure how light bends inside a gem. I’m testing an aquamarine here. You’ll see how the shadow line moves as the filter rotates, showing the high and low refractive indices. Their difference is the ...

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$Brix explained: how to measure sugar in forage with a refractometer$

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