Gemmological Refractometers

Refractometers for gemstone identification.

RGM-181 Gemmological Refractometer

Gemmological Refractometers are used to measure the Refractive Index of gemstones, as well as the index double Refraction. Through the parameter you can judge whether a gem is uniaxial or biaxial photo-positive or photo-negative. RGM-181 : Gemmological Refractometer 1.30 to 1.81 RI ± 0.01 Scale division 0.01 (LED illumination built in 589nm) CZ hard glass prism reduces scratching Polariser ...