digital refractometer / dual-scale / Abbe / with temperature control

- High-precision refractometer
- Automatic dispersion measurement
- Seven wavelengths fixed
- Automatic ABBE number measurement
- Ideal for research and development

The digital, fully automatic spectral refractometer ATR-L consists of an electronic unit separated from the stainless steel measuring unit. Dispersion measurement at 7 wavelengths over the full visible range. A sample volume of 0,3 ml is sufficient for measuring. The refractometer is equipped with a Peltier thermostat (no external water bath/thermostat necessary).

Multiple wavelength digital refractometer for dispersion measurements.

Refractometers are widely used in food, oil, fuel and other industries to measure the concentration of components in order to monitor and control the fabrication process. They measure the critical angle of total reflection and calculate the refractive index from this value. The refractive index of a substance depends on the wavelength of light and usually increases towards shorter wavelengths.

For a better characterisation of this behaviour, Abbè introduced the so-called Abbè-number which is an arithmetical dimensionless value calculated from measured refractive indices at 486, 546, 656 nm. Nowadays, this is not used frequently any more, since the development of high-resolution refractometers made it possible, to measure refractive index differences of 0.00001 easily. But information regarding refractive index behaviour at other wavelengths is lost, which could give a fingerprint about the material itself.