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Classification and quality control of precious stones, Krüss offers two models of refractometers, the ER601 and the ER604.
Refractometer for gemstones from Krüss are available as a professional refractometer compact with LED lighting or filter sodium (ER601)
Refractometer-prism of cubic zirconia for added durability
Scale of 1.35 to 1.85, with a precision of 0.003
Refractometer very economic suitable for students of Gemology, offices and jewelry stores.
Includes polarizer filter light, filter, monochromatic...
Refractometer for gemstones from Krüss are available as refractometer standard with filter sodium and LED lighting sold separately .