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Innovative gemstone refractometer with built-in LEDs for mains and battery operation. Refractometer contact liquid ND 1.79 and polarization filte...

GEMMODUL Module 3 LED Refractometer lighting base with monochromatic light for sharp, high-contrast images. LED refractometer lighting base Dim...

Gemstone refractometer with built-in filter (1.30 - 1.81 nD): Direct and easy to read scale from 1.30 - 1.81 nD with a division of 0.01. Reading 0...

The Krüss gemstone refractometers are offered either as a compact professional or standard version. They both provide a sharp image and good readab...