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Gemstone Refractometer ER604

Gemstone Refractometer ER604
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€ 397.46

19 % VAT incl. excl. Shipping costs

Shipping time: 3-6 days (EU) 5-21 days (world)


Gemstone Refractometer ER604

A standard compact gemstone refractometer

- Resolution: 0.01 nD
- Measurement range: 1.33 – 1.81 nD
- Na-filter 589 nm
- No integrated illumination,
  suitable for all light sources.
- lightweight  (0.4kg)
- Aluminium housing

Gemstone refractometers are used for the classification and quality control of gemstones. The gemstone to be examined is simply placed on the prism with a drop of contact fluid. The refractive index of the gemstone is read through the ocular of the refractometer. The refractive index is an important parameter in classifying a mineral or gemstone. Each mineral has its typical refractive index, due to its chemical composition and crystalline structure. Our gemstone refractometers are characterised by their particularly sharp image and good readability.

With the sodium filter that only lets through light with a wavelength of 589 nm, the refractometer can be used as a mobile unit with an ordinary light source or with sufficient ambient lighting.

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Manufacturer information

A.KRÜSS Optronic
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