Chemical Refractometers By KRÜSS

Portable, Benchtop & Process Models

Refractive index is an important parameter used in determining the quality, quantity, purity or mixing ratio of a chemical substance. It is a common measurement used by a variety of industries – chemical, food & beverage, cosmetic, flavors and fragrances, pharmaceutical, metal working, petrochemical, education/research and environmental. Krüss manufactures a wide variety of Krüss refractometer models to suit your needs from digital to manual hand-held portable refractometers. Each group of chemical refractometer products are listed below. Click here to learn some refractometer cleaning tips.

Digital Refractometers:

Digital Refractometer

DR 6000 Digital Refractometers

Key Features of the DR6000 Series Digital Refractometer

  • Very fast and reliable measurement
  • Measurement of turbid and highly viscous samples
  • Four different digital refractometer models available depending on accuracy needs and measurement range requirements
  • Ranges include nD 1.32000 to nD 1.70000 +/- 0.00001; 0-95% Brix / User-defined scales are also available
  • Fast and accurate Peltier temperature control (10 to 80°C) or Temperature Compensation (ICUMSA or freely definable)
  • Chemically resistant materials such as sapphire prism
  • Intuitive operation via touchscreen display
  • Complete data recording and backup including audit trail
  • User authorization levels
  • Conforms with National and International standards such as 21 CFR Part 11, GMP/GLP, ICUMSA, ASTM, ISO, AOAC International, USP, BP, JP, Ph. Eur, OIML, ISO, DIN, OIV, AOCS and more

Abbe Refractometers:

Abbe Refractometer

Abbe Refractometers

Abbe chemical refractometers measure the refractive index based on the principle of the total reflection that occurs at the boundary between a prism and a sample. They are ideal for the measurement of the refractive index of solid samples such as glass, plastics, polymers as well as foils, pastes and viscous liquids. A.Krüss Optronic carries two Abbe benchtop refractometer models.

Abbe Refractometer

AR4 Abbe Refractometer

  • Determine refractive index between nD 1.3000 and 1.7200 and the sugar content in the range of 0 – 95 % Brix
  • Scales are adjusted manually using the drive knob and the measured value is read through the eyepiece
  • Integrated digital thermometer shows temperature on the LCD display
  • Temperature control is available via an external circulating water bath (not included) such as the Krüss PT31 or PT80
Abbe Refractometer

AR2008 Abbe Refractometer

  • Digital LCD display of refractive index or Brix value together with the temperature
  • Automatic temperature compensation feature
  • Measurement range of 1.3000 to 1.7200 nD; 0 to 95% Brix
  • Designed for harsh environments
  • Thermostat connections for both illumination prism and measurement prism
  • Serial RS-232 and RS-422 interfaces
  • Temperature control is available via an external circulating water bath (not included) such as the Krüss PT31 or PT80

Process Refractometers:

Accurate Results for Automatic and Continuous Process Control

A.Krüss Optronic offers both “In-Line” and “At-Line” for monitoring refractive index in a process environment:

Process Refractometer

In-Line Process Refractometer


Process Refractometer

At-Line Process Refractometer

For Features, Specifications and Applications for these Process Refractometer models see the links below or contact your AGS Sales representative:

Inline Refractometer Information

Atline Refractometer Information

Digital Handheld Refractometers:

A.KRÜSS Optronic Digital hand-held refractometers are ideal for mobile use and have a large measurement range. Use a digital portable refractometer to inspect incoming goods, optimize quality assurance and reduce work processes. They are lightweight and easily fit in a lab coat pocket. There are three models to choose from:

Digital Handheld Refractometers

Digital Handheld Refractometers

DR301-95 Key features:

  • The most advanced digital hand-held model with many features and functions found in the standard laboratory model
  • Large measuring range and high precision: nD 1.3330 to 1.5318, 0-95% Brix
  • Choose from refractive index scale, sugar scale, salt scale plus the ability for programming 2 User-defined scales
  • Use the 9-volt battery option for mobility or the optional power supply to convert it into a small laboratory unit
  • Easy to calibrate with water
  • Temperature compensation for Brix measurements from 5 to 40 degrees C
  • Robust casing, light weight and easy to clean
  • USB Interface allows for sending data to PC or printer
  • Alarm option for monitoring limit values in production

DR201-95 Key Features

  • Compact digital handheld refractometer which eliminates errors caused by misreading a manual refractometer
  • Wide measuring range on the refractive index scale (1.3330 to 1.5318 nD) and the sugar scale (0 to 95% Brix)
  • Splash proof and meets IP64 Standard
  • Easy to calibrate with water
  • Rugged case and low maintenance
  • Temperature compensation from 10 to 40 degrees C for measuring sugars in beverages and confectionaries
  • 5 V battery lasts for over 1000 measurements

DR101-60 Key Features

  • Good entry-level model with measurement range of 1.3330 to 1.4419 nD, 0 TO 60% Brix
  • Low cost and low maintenance
  • Waterproof case allows the unit to be rinsed under running water and meets IP65 Code
  • Temperature compensation from 10 to 40 degrees C for Brix measurements
  • Easy to calibrate with water

Click the following link for more information Digital Handheld Refractometer Information

Handheld Refractometers:

Handheld Refractometers

Handheld Refractometers

Handheld refractometers are barely larger than a flashlight and can be used just about anywhere. They are easy to use, very robust and require no batteries. The models will differ based on their application such as the determination of salt content (salinity), water content in honey, Brix, alcohol content, urine and serum specific gravity, Oechsle, antifreeze and battery acid.

Key Features:

  • Small size for mobile use
  • Automatic temperature compensation for all models
  • High resolution of the scale areas
  • Robust and compact design
  • Easy calibration and adjustment

 Model Specifications


Scale Range Accuracy



Brix 0 – 10% Brix

+/- 0.1% Brix

Sugar content in fruit, grapes, juices, vegetables, foods and cooling fluids


Brix 0 – 18% Brix

+/- 0.1% Brix

Sugar content in fruit, grapes, juices, vegetables, foods and cooling fluids


Brix 0 – 32% Brix

+/- 0.2% Brix

Sugar content in fruit, grapes, juices, vegetables, foods and cooling fluids
HRB62-T Brix 28 – 62% Brix

+/- 0.2% Brix

Analysis of chemical and technical fluids, e.g. oils, greases, radiator fluids and lubricants
HRB82-T Brix 45 – 82% Brix +/- 0.2% Brix Analysis of highly concentrated sugar solutions as well as chemical fluids like fats, radiator fluids and lubricants
HRB90 Brix (with thermometer) 6 – 36°C 0-90% Brix +/- 0.2% Brix Universal Handheld refractometer for determining sugar content of fruits, grapes, juices, vegetables, foods, oils, coolants, lubricants and other sugary substances
HRB92-T Brix


Water content in honey

58 – 92% Brix

38 – 43 °Bé

12 – 27% Water content in honey

+/- 0.5% Brix

+/- 0.5°Bé

+/- 0.5% Water in honey

Examination of highly concentrated sugar solutions; analysis of fats and lubricants and foods; Water content of honey;

Relative density with respect to Baumé scale

HRH30-T Water content in Honey 12 – 30% Water content in honey +/- 0.1% Water content in honey Examination of the water content of honey
HRND Refractive Index 1.3330 – 1.5170 +/- 0.0005 Universal handheld refractometer for refractive indices. Measuring range covers the most frequent substances of Pharmacy requirements
HRS10-T Salinity (NaCl)

Specific gravity

0 – 10%

1.000 – 1.070

+/- 0.1%

+/- 0.001

Salt content determination in liquids such as seawater, beverages and preservatives in foods; Determination of the specific density of liquids at 20°C with respect to water
HRS28-T Salinity (NaCl) 0 – 28% +/- 0.2% Salt content determination  (NaCl) in liquids such as seawater, in beverages and in preservatives of food
HRM18-T Refractive index

Serum protein specific gravity

Urine specific gravity

1.3330 – 1.3600

0 – 12 g/dl

1.000 – 1.050 UG

+/- 0.0005

+/- 0.2 g/dl

+/- 0.002 UG

Examination of urine samples for refractive index, protein content and specific gravity
HRO32-T Brix


Potential Alcohol Content

0-32 % Brix

30 – 130 °Oe

4.4 – 19% alcohol

+/- 0.2% Brix

+/- 1 °Oe

+/- 0.1% alcohol

Examination of grape must and alcoholic beverages
HRKFZ-T Ethylene and Propylene glycol (antifreeze)

Battery acid

-50 – 0°C

1.10 – 1.30 g/cm3

+/- 5°C

+/- 0.01 g/cm3

Determination of glycol content in coolants;

Determination of acid content in batteries

A.KRÜSS Optronic Products

Chemical Refractometers By KRÜSS


For detailed Krüss refractometer applications information, please visit the following link:  Refractometer Applications

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