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• Color: black.
• Measuring Range: 1.30 – 1.81 RI
• Minimum Graduation (RI): 0.01 RI
• Illumination: Internal illumination with momentary switch(Standard wavelenth 589nm)
• Size: Approx 11.3*6cm
• Scale Division: 0.01 nD
• Weight: Approx 330g
• Ranges of Application: Laboratory, Gemology
• Filter: Polarizing filter
• Power Source: 1.5V x3 button cell
• Made of Lead glass

• Gemological Gemstone Gem Refractometer Bulit-in Light
• Convenient & easy to carry
• With built-in light source that makes it a carry-and-use-it-anywhere device
• Comes with Automatic Temperature Compensation (ATC) that let itself adjust to the climate
• Approved by strict quality and safety standards
• Undoubtedly durable and very reliable

• Open the upper cover then wash the gem and prism with alcohol.
• 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)
• 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.
• Press the light momentary switch, make sure that the internal light source is turned on when testing.
• 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.

• 1*Refractometer
• 1*Storage Case
• 1*Refractive oil
• User's Manual

• Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.
• Please understand that colors may exist chromatic aberration as the different placement of pictures.