Aluminum Alloy Gemological Refractometer Gemstone Testing Instrument FGR-003
Brand Name:VANCO
Certification:CE
Model Number:FGR-003
Minimum Order Quantity:50
Delivery Time:As per order quantity
Place of Origin:CHINA
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Location:
Ningbo Zhejiang China
Address:
NO.58 WEST MAOCHENG ROAD ,YINZHOU DISTRICT,NINGBO 315192 CHINA
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FGR-003 Gemological Refractometer
The refractometer is considered by some to be the most important of
all gem identification instruments. It can be indicated (not
measures) the refraction index of a gemstone, which often gives
vital clues to the identity of a gemstone. Fable brand
Refractometer provides a numerical reading from a scale you see
when you look through the eyepiece and determine whether a stone
with single or double refracting by its physical characteristics.
The refractometer works well with transparent, translucent as well
as opaque polished stone.
Features:
1. Scale rang: 1.35-1.85;
2. Accuracy: 0.003;
3. Gross Weight: 1 kg;
4. Table material: Aluminum alloy;
5. Two ways of power supply: 2x AAA batteries and/or 3V adaptor;
6. With Durable CZ testing table;
7. With Built-in Monochromatic LED light;
8. With Large visual field and easy to read.
9. With an eyepiece
10. With 2ml RI Liquid
11. Package: Color box Package.
Dimension: 222x182x80mm.
The refractometer is considered by some to be the most important of
all gem identification instruments. It can be indicated (not
measures) the refraction index of a gemstone, which often gives
vital clues to the identity of a gemstone. Fable brand
Refractometer provides a numerical reading from a scale you see
when you look through the eyepiece and determine whether a stone
with single or double refracting by its physical characteristics.
The refractometer works well with transparent, translucent as well
as opaque polished stone.
Measuring Method
1. Myopia Method (Known as facet method).
Testing Steps:
① Cleaning Gemstone and testing table by alcohol.
② Power on and observe if it is clear
③ Placing the biggest facet of stone in the metal stage
④ Dropping RI liquid (2mm diameter) to the middle of the testing
table
⑤ Changing the stone from the stage to middle of testing table and
making sure the stone connect well with the liquid and Covering.
⑥ Closing with the eyepiece by your eye and observing the half dark
and bright showing and reading out the line between them
⑦ Moving 360 degree of the stone around slowly, you can make a
reading and record when move to each angle.
⑧ Testing finished, please move the stone from the testing table to
stage then take it off for protecting well the testing table
⑨ Cleaning the stone as well as testing table, please do clean the
testing table in a direction by cotton ball with alcohol
2. Distant Vision Technique Method (Known as spot method).
Testing Steps:
① Removing the eyepiece.
② Picking up the sample and cleaning it
③ Dropping RI liquid (2mm diameter) to the middle of the testing
table and making sure the testing sample get touch with the liquid
④ Making the eyes far away from the eyepiece in between 25 to 30cm
and viewing the shadow which comes out from the testing stone by
the eyepiece pot. If it is arc gemstone, the oval shadow will be
showed
⑤ Please keep your eyes moving up and down when you see the image
of the droplet (the image will keep moving with your moving eyes),
please note the color of the image
⑥ You will get half dark and half bright in the middle of the image
which is the refractive inde
Aluminum Alloy Gemological Refractometer Gemstone Testing Instrument FGR-003
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