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 ...