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Digital Lab Refractometers

Refractometers >> Digital Lab Refractometers

Digital Lab Refractometers

Short measuring times at maximum accuracy

High-precision Digital Lab Refractometer series DR6000 for applications such as mixing-ratio, quality and quantity control, plus determination of purity.

Features & Specifications

  • With a simple, intuitive touchscreen all results and user management can be operated on the device. The unit incorporates an integrated SQL database, for storing data, and allows for access via a network or standalone PC.
  • The DR6000 has an integrated Peltier thermostat for efficient temperature control, allowing very short measuring times at maximum accuracy.
  • Easy cleaning of the probe.
  • Interface and software package for full GLP compliance.

Four standard models are available in this series, varying according to range, resolution and accuracy.
For prices and availability information on the DR series of Digital Refractometers for the Laboratory, please contact your nearest Krüss distributor, who will be delighted to help.

PDFFor full technical specifications, please download the brochure here.


Which model should you choose?


Model Range
1.3200 – 1.5800 nD
0-95 %Brix
1.3200 – 1.7000 nD
0-95 %Brix
0.0001 nD
0.1 %Brix
0.00001 nD
0.01 %Brix
0.0001 nD
0.1 %Brix
0.00002 nD
0.01 %Brix
DR6000 x x x
DR6100 x x x
DR6200 x x x
DR6300 x x x


with built-in electronic Peltier thermostat

Model Temperature control range Temperature accuracy Temperature stability
DR6000-T 10–80 °C (optional) ±0.1 °C 0.05 °C
DR6100-T “ “ “
DR6200-T “ “ “
DR6300-T “ “ “


with flow cell

The flow cell is a variation of the DR6000 series and is indicated by the suffix “F” (e.g. -F, -TF). It consists of a measuring cell cover fixed with robust stainless steel brackets over the prism, with two tubes for inflow and outflow. All parts that come into contact with the sample (tubes and measuring cell cover) are made of PTFE (Teflon). Combined with the sapphire prism equipped with a Peltier thermostat, precise and stable temperature control is assured. The UNF-thread hose coupling is made of PEEK.

DR6000 with flow cell

The flow cell allows the unit to run in automated mode using a peristaltic pump or autosampler. It can also be filled by means of injection if required. Thanks to its special geometry (forced venting), no air bubbles can become trapped. As a result of the small size of the micro-measuring cell, this version is particularly suitable for applications in which it is important for samples to be in small volumes (e.g. in the flavourings industry).

The measuring cell can be removed easily and the sample thus placed directly on to the prism.

with integrated electronic Peltier thermostat and flowcell

TF models are a combination of T- and F-models.



Stefan Wegner from Krüss shows the DR6000 benchtop digital refractometer at Pittcon 2011 in Atlanta.
(Interview by



KRÜSS digital lab refractometers in the laboratory

KRÜSS digital lab refractometers – News and Blog


How does a Digital Refractometer work?

The measurement of refractive index, also called the index of refraction, is a straightforward process when using modern instruments. Nevertheless the generation of accurate and reproducible results demands that appropriate techniques are used and laboratory technicians are adequately trained.

One major advantage of a modern digital refractometer is that sample preparation is no longer necessary. Liquid samples can simply be placed on the measuring prism and the analysis begun. Good practice requires that the calibration of the instrument is regularly checked, and this can be done by simply measuring the refractive index of a sample of distilled water.

One factor that must be considered is temperature: the refractive index of a substance varies with temperature, and so this must be carefully controlled. A digital refractometer will either incorporate a Peltier temperature control element or, in the case of less advanced instruments, a water bath controlled by thermostat.

DR6000 Digital Refractometer
DR6000 Digital Refractometer

intuitive touch screen
intuitive touch screen



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