Refractometer Scale - Search Videos

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

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 ...

657 views2 months ago

Top videos

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This is how checked AdBlue quality using Hand Held DEF AdBlue Refr…

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