Description
xGemological refractometer
Model:FGR-002A
Specifications:
High hardness Synthetic CZ test prism
Scale range:1.35-1.85
Acurracy: ≦±002
Stainless steel table,corrosion-resistant,easy to clean
Professional optical design,shadow edge is ultra-straight and clear,easy to read; and Internally installed the monochromatic light (wavelength:589.5nm)
There are two ways of inputing the voltage:2 xAAA batteries and DC3V 50mA direct current suply(AC100—240V).
2ml refractive index Liquid(1.78±005) with glass bottle
★ with Two levels of light brightness,adjustable by switch, convenient for measuring the refractive index of gemstones with different properties;
★Equipped with a polarizer;
★Eyepiece: 32mm in diameter, with magnifying function;
Test conditions: Temperature: room temperature 5-35°C, humidity: ≤75%, no acid, alkali and other corrosive gases in the room;
Size: 140mm×42mm×95mm;
Prism size: 14mm×4mm;
Metal table size: 37mm×68mm;
Weight: 390g;
Minimum scale: 0.01. Scale is marked finer, with not only 1.40,1.50,1.60 but also 1.45,1.55,1.65...
Application
A lightweight measuring instrument used by jewellers and traders of gemstones to measure polished stones over a refractive index range of 1.30 to 1.81 RI.
This instrument can also be used to identify whether a particular stone is Isotropic or Anistropic (uniaxial or biaxial).
Differences of all our 5 Gem refractometer Models
| Model | Color | Accuracy | Table Material | Finer Scale | Built in battery | For Mounted Stones | Two level Brightness |
| FGR-003 | White | 0.003 | Aluminum alloy | 1.40,1.50,... | / | / | / |
| FGR-003A(Portable) | Black | 0.003 | Aluminum alloy | 1.40,1.50,... | Yes | / | / |
| FGR-002 | White | 0.002 | Stainless steel | 1.40,1.50,... | / | / | / |
| FGR-002J | White | 0.002 | Stainless steel | 1.40,1.50,... | / | Yes | / |
| FGR-002A | White | 0.002 | Stainless steel | 1.40,1.45,1.50,1.55,... | / | / | Yes |
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