Product Description:

Gem Refractometer,Jewelry 1.30-1.81 Professional Gemstone ldentification
 
Gem refractometer
 
Measuring range: 1.30~1.81; minimum scale: 0.01 weight: 350 grams; volume: 64 * 110 * 340mm
The gem refractometer is characterized by its compactness and handiness. Easy to carry
The  refractive index is a very importantem refractometer Measuring range: 1.30~1.81; minimum scale: 0.01 weight: 350 grams; volume: 64 * 110 * 340mm The gem refractometer is characterized by its compactness and handiness. Easy to carry The refractive index is a very important optical parameter, and the properties of a gemstone can be determined according to this parameter. A variety of gems can be measured according to the refractive index values, because different gemstones have fixed refractive index. In addition, double refractive index can also be measured. According to this parameter to judge whether a gem is uniaxial or biaxial photopositive or negative phototaxis is. 
 
Operation method: 
 
1. place the instrument on the table top. Open the top cover (1). Drop a few drops of refraction oil on a prism (5) with a thin sheet of glass. 
2. The bottom of the stone to be measured shall be placed on the prism, lightly pressed so that the refractive oil is uniformly dispersed on two surfaces (the prism, the mirror and the bottom of the gem). Then, cover the top. 
3. the refractometer filters into light and light source adjustment to a straight line, so that to observe in uniform light. 
4. move the eyepiece up and down. Diopter adjustment. Then you'll see a light and dark line in the observation area. Where the boundary between the light and the dark is the refractive index of the gem. 
5.the double refractive index of the gem can be measured precisely, because the filter of the refractometer can prevent scattering. Measuring method: Move the polarizer (6) and transfer it to the eyepiece. Then, spin the polarizer gently. You can only read the refractive index in one direction at a time because the polarizer can only let light pass in one direction. Then, rotate the polarizer 90 degrees, and you can read the refraction index values after the right angle rotation. Rotate the stone in a small angle in the same direction, and then rotate the polarizer to obtain another set of refractive index values according to the above procedure. Repeat the operation until the jewel is rotated to 180 degrees. A difference is found in the refractive index of these sets: a set of maximum refractive index values and a minimum refractive index value. The difference is the double refractive index of the gem.
 6. after measuring, clean the refraction oil on the prism, and then put the prism in the box to save it. 
 
Matters needing attention
 
1. the instrument is assembled by precision components. Please do not disassemble it yourself. After use, please put it in a dry place, to prevent moisture from affecting the accuracy of measurement. 
2. refraction oil should be sealed and preserved. When in use, drop a few drops on a thin glass sheet, and do not rub it in your hands or eyes. 
3. the light source should be bright and uniform for observation optical parameter, and the  properties of a gemstone can be determined according to this parameter. 
 
A  variety of gems can be measured according to the refractive index  values, because different gemstones have fixed refractive index. In  addition, double refractive index can also be measured. 
 
According to this parameter to judge whether a gem is uniaxial or biaxial photopositive or negative phototaxis is.
 
 
Operation method:
 
1.  Place the instrument on the table top. Open the top cover (1). Drop a  few drops of refraction oil on a prism (5) with a thin sheet of glass.
2.  The bottom of the stone to be measured shall be placed on the prism,  lightly pressed so that the refractive oil is uniformly dispersed on two  surfaces (the prism, the mirror and the bottom of the gem). Then, cover  the top.
3. The refractometer filters into light and light source adjustment to a straight line, so that to observe in uniform light.
4.  Move the eyepiece up and down. Diopter adjustment. Then you'll see a  light and dark line in the observation area. Where the boundary between  the light and the dark is the refractive index of the gem.
5. The double refractive index of the gem can be measured precisely,  because the filter of the refractometer can prevent scattering.
Measuring method:
 
Move the polarizer (6) and transfer it to the eyepiece. Then, spin the polarizer gently.
 
You  can only read the refractive index in one direction at a time because  the polarizer can only let light pass in one direction. 
 
Then, rotate the polarizer 90 degrees, and you can read the refraction index values after the right angle rotation.
 
Rotate  the stone in a small angle in the same direction, and then rotate the  polarizer to obtain another set of refractive index values according to  the above procedure. 
 
Repeat  the operation until the jewel is rotated to 180 degrees. A difference  is found in the refractive index of these sets: a set of maximum  refractive index values and a minimum refractive index value.
 
The difference is the double refractive index of the gem.
 
6. after measuring, clean the refraction oil on the prism, and then put the prism in the box to save it.
Matters needing attention
1.  the instrument is assembled by precision components. Please do not  disassemble it yourself. After use, please put it in a dry place, to  prevent moisture from affecting the accuracy of measurement.
2.  refraction oil should be sealed and preserved. When in use, drop a few  drops on a thin glass sheet, and do not rub it in your hands or eyes.
3. the light source should be bright and uniform for observation
 
Attention: The battery has not included, please prepare the AG13 button batteries by yourself.
 


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