- Stock: In Stock
- Model: 1276068
Features:ÂÂ
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Accuracy: ±0.002
3 x Button Cell
1 x Oil
1 x English Manual
Operating Information:
1. Open the upper cover then wash the gem and prism with alcohol.
2. Lay the instrument on the worktable. Drop a little bit of special refractive oil onto the surface of prism and press it by a thin glass bar. (Be sure not too much or too little)
3. Make sure the ground surface of gem to be measured is close to the prism, press it again lightly, let the refractive oil be evenly distributed between the two surfaces then close the upper cover.
4. Press the light momentary switch, make sure that the internal light source is turned on when testing.
5. Move the eyepiece up and down and adjust the diopter accordingly. By this time you can see a light/dark boundary in the viewing field. The gradation (shade) on which the boundary located is called the refractive index of gem.
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