Real Instruments Compact Digital Gem Portable Refractometer, ABS Gem Refractometer, RHG181 1.30-1.81 Presidium Gemstone ldentification Tester for Jewelry, Gold ＆ Silver and Diamond, Lab Refractometers, RHG-181

• 【Professional Design】This refractometer is specially designed to measure the refractive index of gemstones and solid materials. The minimalist design style makes it very suitable for use.Considered by many to be the most important of all gem testing instruments.
• 【High Quality】Quality all metal construction, low battery consumption can be used for a long time.Approved by strict quality and safety standards and is trouble-free to use.
• 【Package Contents】Built-in LED flashlight, 30x jewelers loupe in silver housing, one of the most important gemstone identification tools.Quality gemological refractometer with a bottle of 3ML jewelry identification special refraction oil.
• 【Product Advantages】The refractometer is stable in performance, High precision and easy operation, lightweight and compact, easy to transport and carry.
• 【Professional Functions】Identify single and double gems quickly and precisely.Measurement range of 1.30 - 1.81.Helps identify diamonds, moissanite and colored gems, speeds up the identification of gems in the package.Gemstone Refractometer is the most important and powerful tool for identifying and authenticating polished gemstones and semi-precious stones, as well as for observing the optical properties and structure of precious stones.

Features:

• HEAVY-DUTY and Built to last
• Provides three (3) 1.5V button-type batteries
• Convenient & easy to carry
• With a 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
• A bottle of Refractive Index Fluid is provided
• Approved by strict quality and safety standards
• Undoubtedly durable, very reliable, and assures accurate testing results
• Comes with batteries, a soft carrying bag, polarizing filter, index oil, index reference list, and user's manual

Specification:

• Measuring Range: 1.30 - 1.81 RI
• Minimum Graduation : (RI) 0.01 RI
• Illumination: Internal Light Source with momentary/power switch
• Dimension : 35mm x 63mm x 115mm
• Scale Division: 0.01 nD
• Weight: 0.4 kg
• Ranges of Application: Laboratory, Gemology
• Filter: Polarizing filter
• Power Source : 3 x AG13 1.5V button batteries
• Color: Black

The Gem Refractometer, commonly known as Gemstone Refractometer, is the primary and most powerful tool in identifying and authenticating polished precious and semi-precious gemstones and observing the optical properties and structure of gemstones. This model is just as good as the expensive models used in gemological institutes. With the aid of Contact liquid (RI Fluid), which will create an optical contact between the glass and the gemstone, you can measure or test the Refractive Index of faceted stones, transparency or opacity, and its beauty, durability, and scarcity. The refractive index (RI) of a gemstone provides the single most important piece of information to a gemologist seeking to identify an unknown stone. Due to its chemical composition and crystallization structure, each gem has a typical refractive index. In fact, you can also use this tool to measure R.I. for many minerals in crystal form as long as the crystals have a flat and polished face.