ER60-Series Gem Refractometers


ER601

These gemstone refractometers are offered either as a compact professional or standard version. They both provide a sharp image and good readability, and have the option to select LED illumination or ambient light with a sodium filter.

Gemstone refractometers are used for the classification and quality control of gemstones. The gemstone 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. Gemstones with a high RI are generally more brilliant, ie a diamond has a RI of around 2.4, whereas quartz approximately 1.55. 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. LED illumination is also available with a wavelength of 589 nm.

Both gem refractometer models are constructed of cast aluminium, and are supplied complete with a polarisation filter and manual.

 
Model overview
 
Standard Gem Refractometer
Professional Gem Refractometer
Model / Articel-No.
ER604
ER604-LED
ER601-NA
ER601-LED
Measurement range
1.33–1.81 nD
1.33–1.81 nD
1.33–1.83 nD
1.33–1.83 nD
Resolution
0.01 nD
0.01 nD
0.01 nD
0.01 nD
Monochromator
Na-Filter 589 nm
Na-Filter 589 nm
Na-Filter 589 nm
-
Illumination
-
LED 589 nm
LED 589 nm
Power supply
Illumination
-
100–240 V
100–240 V
Prism
Optical glass
Housing
Cast aluminium

 
 
Ordering information Gemstone Refractometers
Model Description Price view shopping cart
ER601   $1235.00
ER601-LED   $1235.00
ER604-LED   $580.00
ER604   $435.00
BM601 LED lighting for ER601 $145.00  
Bm604 LED lighting for ER604 $145.00  
 

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