Professional gemological refractometer GemLED

Professional gemological refractometer for routine refractive index (RI) measurements with integrated monochromatic LED illumination 589 nm built directly into the instrument (on the refractive element). This eliminates the need for an external sodium lamp and achieves a clean and easily readable shadow line.

Key benefits in practice

• Contrast reading at 589 nm (sodium D-line): The integrated monochrome LED illumination supports a sharp image of the shadow line on the scale.
• Convenient scale reading: The manufacturer states a wide field of view and a precise eyepiece (the focusing/shifting method is described differently in the documentation depending on the source).
• Support for birefringence assessment: is part of polarizing filter, which rotates during reading; the manufacturer states it as key for distinguishing monorefraction and birefringence.
• Flexible power supply: traffic from networks from external battery box (AA) for mobile use.
  

Ideal for

• Common gemological RI measurements where monochromatic illumination 589 nm helps to read the shadow line clearly.
• Workplace where you want to have a light source integrated directly in the refractometer (less setup and wiring than with an external lamp).
• Field/mobile use thanks to power supply from the included AA battery box.
  

Package contents

• GemLED® Refractometer (GLD 0.01)
• Contact liquid for refractometer nD 1.79
• Polarizing filter
• External battery box (AA)
• AC power adapter/transformer (switchable for 240-220 V or 120-100 V; 2-pin EU plug)
  

Technical specifications

• Refractive index range: nD 1,30–1,81
• Scale division: 0,01
• Lighting: monochrome LED 589nm (wavelength of sodium D-line)
• Refractive glass element: 5 × 11 mm, SCHOTT/ZEISS La SF (colorless high-quality glass); manufacturer states scratch and chemical resistance
• Dimensions: 135 × 38 × 86 mm
• Weight: 540g
• Power supply (AC adapter): switchable 240-220V / 50-60Hz or 120-100V / 50-60Hz; cable length 1,900mm; protection class II; EMC according to EU standards
  

English manual-PDF