Home > Products > Gem Refractometer > FABLE Gem Refractometer FGR-002 with stainless steel working table
FABLE Gem Refractometer FGR-002 with stainless steel working table
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Product Details
| Place of Origin | Guangdong, China | Brand Name | Fable | |
| Model Number | FGR-002 | Weight | 0.92KG | |
| Measurement Accuracy | 0.002 | Min. Div. | 0.001 | |
| Measurement Range | 1.35-1.85 |
Product Description
FABLE Gem Refractometer FGR-002 with stainless steel working table
Description:
Material | Stainless Steel/CZ/Plastic |
Testing Range | 1.35-1.85 |
Accuracy | <=±0.002 |
Light Source | Built-in Monochrome LED light |
Power | Batteries/ DC 3V |
Refractive Index Liquid | 1.785±0.005 |
Scale Division | 0.01 RI |
Filter | Polarizing Filter |
Packaging | Metal Box |
| Refractometer Instructions - Step by Step | ||
| Label | Description | Instructions |
| 1 | Batteries | The first time you use your refractometer, insert batteries text up into battery case. Tightly close battery cover over batteries for good connection. Press power switch to turn on refractometer. The refractometer takes 3, 1.5V button batteries. |
| 2 | Hemicylinder | Open upper cover and examine hemicylinder. Hemicylinder should be clear of any dust or film from previous use or factory. If hemicylinder needs to be cleaned, use a little water and a soft cloth. Caution! Dried RI liquid can scratch the hemicylinder. If there is dried RI liquid on the hemicylinder, use a drop of RI to re-wet and dissolve any crystals that may have formed before cleaning. |
| 3 | Stone | Examine the stone to be tested under a bright light. Choose the facet with the best polish and largest surface. This is usually the table of the stone. Be sure the stone is clean, wipe with a soft, lint free cloth to remove any fingerprints or dirt. |
| 4 | RI Liquid | Place a small (very small) drop of RI liquid on the upper end of the hemicylinder. Knowing how much RI to use takes some practice. You need just enough RI to create a good seal between the gem and the hemicylinder. As you test more stones you will learn how much RI is needed for the size of the stone. |
5 | Place Stone | Place the facet of the stone you have chosen to test on the RI liquid drop and gently pull it to the center of the hemicylinder. Close upper cover if stone is small enough. For very large stones, leave cover open. |
| 6 | Look through eye piece | Look into eyepiece at about 4-6 inches away so that you can see the scale inside the refractometer. With practice, you will find the right spot to use for your eyes. You may have to hold your head closer or further away from eye piece depending on the stone and your eye sight. |
| 7 | Be a snake charmer! | Slightly move your head, up and down, side to side, and closer and further away from the refractometer until you see a blue-green flash line. (If you feel like a snake charmer, you are doing it right!) This line is usually in between the darker and lighter area on the scale. It is a light sort of teal color line. On bright, clear, clean, well polished stones, the line can be very sharp and clear. For other stones, it is very faint and hard to find. On stone that don’t have a good polish or flat surface, you may not be able to get a reading. If the scale appears dark all the way down to the bottom of the scale, then the stone’s refractive index is too high to read or you have used too much RI liquid. |
| 8 | Take your reading | Read the RI from the higher edge of the blue- green band. RI is read to the nearest hundredth place (eg. 1.65 ) |
| 9 | Use the chart | Compare your finding with a Refractive Index Chart. There is one you can use near the bottom of this page. |
Contact Us
- Shenzhen Fable Jewellery Technology Co., Ltd.
- Contact nameCelina K Chat Now
- Phone86-755-89583846-809
- AddressPinghu, Shenzhen, Guangdong
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