Specifications

gemological refractometer,digital gem refractometer
No need refractive index liquid
Wide testing range: 1.30-2.99

Digital Gemological Refractometer (FGR-DA)

 

  

Description

The Digital Gem Refractometer is a nice optical instrument which will give a reading of the refractive index of a clean, flat, well-polished facet to reproducibility of 0.007RI index units. With covering the full range from 1.30 to 2.99RI, It is an ideal instrument to identify the gem stones. The importance is that it can test the gem stones without requiring ANY messy, damaging contact oil.

 

 

Specification

Dual purpose for refractive index and reflectivity,

Digital display

Oilless test: don’t need the refractive lndex liquid

Wide testing range: 1.30-2.99;

Digital circuit design, unaffected by ambient light, stable testing data

Error: less than or equal to 0.008

Power:9V battery;working temperature:10-28 degree

 

 

    

 include

 1.Clean sample

2.Clean test platform

3.Place sample

4.Adjust center position

5.Press Test Button and Read index value

6.Adjust sample positions and get correct index

 

 

Refractive Index of Some Gemstone

 

Quartz: 1.544-1.558RI

Topaz: 1.63-1.64RI

Ruby: 1.74-1.78RI

Cubic Zirconia : 2.15-2.18RI

Diamond: 2.37-2.46RI