Gem Refractometer white Magnification_Multi magnification horizontally 8 or 9 words

horizontally 8 or 9 words (most of the width of a paperback page)

calibration was by turning a knob (not electronic)

How does it work

Overall: 199 X 153 X 29mm (without the add-on dish)

06ct) so if the stone is small

Gem Refractometer white Magnification_Multi magnification horizontally 8 or 9 wordsSummary For the gemmologist the refractometer is the most important gem tester after a loupe. It measures refractive index (to what extent light is bent as it passes through the gemstone). This product is intended for gemmologists (or those about to study gemmology) instructions are not included. Advanced model, has the advantages (over the standard model): large eyepiece enables easy viewing of the measuring scale (much easier than on a standard