This Optical Refractometer is specially design to obtain refractive index meter of  gemstone. It is user friendly, simple and portable.

it can test up to 131 type of gem stone.

Quick Details
Place of Origin:Fujian, China (Mainland), Fuzhou, China (Mainland)
Brand Name:Xingguang
Model Number:SDG-181
Size:32*61*128mm, 32*61*128mm
Measurement Accuracy:0.01
Min. Div.:0.01
Brix Min. Div.:0.01
Measurement Range:1.30~1.81, 1.30~1.81RI
Gross Weight:700g
package:Black Leather Box
Min. Div:0.01