ATR-L Dispersion Refractometer

Multiple wavelength digital refractometer for dispersion measurements.

The ATR-L is a digital, fully automatic spectral refractometer used to determine the refractive index of liquids of various viscosities regardless of opacity or color. The stainless steel measuring head allows for a minimum sample volume of 0.3 ml and is separate from the electronic control unit.

The ATR-L includes a built-in Peltier system and a precision thermometer for fast, precise temperature control. The use of discrete LEDs provides automatic dispersion measurement between 350nm and 1000nm at seven wavelengths making it possible to implement any combination of customer-specified wavelengths within the instrument and carry out quasi-spectral measurements in close to real-time.


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

Main specifications

Measuring scales Refractive Index (RI)
Sucrose (°Brix)
Measuring range 1,33200 – 1,70000 RI / 100 °Brix
Resolution 0,00001 RI / 0,01 °Brix
Precision ± 0.00004 RI* / ± 0.03 °Brix
Reproducibility ± 0.00004 RI* / ± 0.03 °Brix
Measurement mode Single sample


Ambient temperature 15 °C – 40 °C
Temperature measurement NTC sensor for measurement of sample temperature placed inside the prism
Temperature control sample By build-in solid-state Peltier-thermostat
Temperature control range 10 °C – 80 °C
Temperature resolution 0.01 °C
Temperature precision ± 0.03 °C
Temperature reproducibility ± 0.02 °C
Temperature compensation Brix 10 °C – 80 °C

Additional information

Prism YAG
Light source/wavelength LED, 7 discrete wavelength fixed 400, 450, 490, 545, 589, 660, 700 nm (others on request)
Display backlit LCD, 16 x16 characters
Operation 20 key membrane including function keys
Interfaces/communication RS232 C serial bi-directional port, parallel interface (Centronics), USB optional


Standards International Pharmacopoeia, ASTM, AOAC, DIN, FDA, ICUMSA, and others

* Standard conditions (589 nm, 20°C)