Refractometer white For the partially sighted_No EPNS (electroplated nickel-silver) and Sheffield

EPNS (electroplated nickel-silver) and Sheffield Plate

adjustable in two directions

you won't be able to read anything at all at hight magnification

See my short description of screw types

Refractometer white For the partially sighted_No EPNS (electroplated nickel-silver) and SheffieldSummary 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