Gem Refractometer, buy Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece on China Suppliers Mobile

Product Details

Two switches of lighting FABLE professornal Refractometer

FGR-002A with larger eyepiece

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. Replacement Batteries: LR44 button batteries (Energizer® 357 Battery is one brand name.) You will find them in the watch / calculator battery section of drug stores, Wal-Mart, K-Mart, and probably your grocery store.
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.

$Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$ $Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$

$Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$

$Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$ $Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$

$Two switches of lighting FABLE professornal Refractometer FGR-002A with larger eyepiece$