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Refractometer

Refractometers from A.KRÜSS measure the refractive index of liquids, pastes and solids with high precision. In close cooperation with renowned partners from industry and research, we have developed refractometers that can be easily integrated into existing laboratory workflows.

Subcategories

  • Handheld Refractometers

    Digital Handheld Refractometers for Precision Refractive Index Measurement for Laboratories and Industry

    Digital handheld refractometers are versatile and precise instruments designed for measuring the refractive index of liquids and solutions across various industries and laboratory applications. These compact devices offer exceptional accuracy and ease of use, making them ideal for quality control, research, and fieldwork.

    With advanced digital technology, these refractometers provide instant, reliable readings with minimal sample volume, ensuring efficiency in applications such as pharmaceuticals, food and beverage production, chemical analysis, and environmental testing. They support multi-application needs, including monitoring concentration levels, purity testing, and process optimization.

    Key features include user-friendly interfaces, robust construction for industrial environments, and compatibility with a wide range of samples, from viscous liquids to transparent solutions. These tools deliver consistent performance, helping professionals maintain high standards in their workflows.

  • Laboratory refractometers

    Digital laboratory refractometers measure the critical angle of total internal reflection in reflection. With an optical CCD sensor, Peltiertemperature control, measurement electronics, evaluation electronics and touch display, the devices contain all the components needed to deliver highly accurate and reproducible measurements.

    Various models are available to meet the different requirements for temperature control and measurement ranges.

  • Abbe refractometer

    The KRÜSS ABBE refractometers measure the refractive index over the limiting angle of total internal reflection. Both the AR4 model and the AR2008 model are both analog ABBE refractometers. On both devices, the light/dark boundary line is set on the reticle by the user. The AR2008 has a digital measurement display and the transmission to the interface is also digital.

  • Process refractometers

    The process refractometers from A.KRÜSS Optronic enable continuous quality testing and the determination of concentrations and mixing ratios during the process. This ensures that predefined quality standards for end products and process control measures are fulfilled in real time. The process refractometers of the PR21 series differ according to the type of process integration in inline or bypass real time measurement.

  • Calibration accessories

    KRÜSS calibration standards are used to ensure maximum measurement accuracy over a long period of time. All measurement devices should be calibrated and adjusted regularly. Many of our calibration standards for digital refractometers are traceable to an internationally accepted standard according to N.I.S.T. For polarimeters, we offer a selection of PTB-certified premium quartz control plates and more cost-effective quartz control plates with a factory certificate traceable to the PTB. Our density standards are very inert and guarantee a long shelf life of 5 years unopened. We also offer high-quality, certified standards as control and reference solutions for melting point determination and for our flame photometers.

Active filters

KERN KERN ORM 1RS digital refractometer for Brix value

Model
Scales
Measuring capacity
Accuracy
Division
ORM 1RS
Refractive index
Brix
1,3330 nD - 1,5177 nD
0,0 % - 90,0 %
0,0003 nD
0,2 %
0,0001 nD
0,1 %

The following models are particularly suitable for basic measurement where the result is required in Brix or refractive index. They are used to determine the sugar content in food or for monitoring processes in the industry (coolant monitoring, water-based mixtures). Alternatively the display can be switched to show Brix or the refractive index.

Main areas of application:

  • Industry: Process and quality control, lubricant control
  • Food processing industry: drinks, fruit, sweets
  • Agriculture: Determining the degree of ripeness of fruit for quality control during the harvest
  • Restaurants and industrial kitchens
€378.00 Regular price €420.00
KERN KERN ORM 50BM digital refractometer for Brix or refractive index

Digital measurement of refraction index for universal application

Refractometer type Handheld refractometer
Scale - Display type Digital
Area of application Basic measurements for Brix and refractive index
Measuring method Total reflection
Measurement temperature (°C) 0 °C – 40 °C
Automatic temperature compensation (ATC)
IP protection - complete device IP65
Dimension (W×D×H) 121×58×25 mm
Brix scale
Measuring range Brix [Min] 0 %
Measuring range Brix [Max] 50 %
Readout Brix 0,1 %
Accuracy Brix 0,2 %
Scale for Refractive index
Readout refractive index 0,0001 nD
Measuring range AdBlue®
€315.00 Regular price €350.00
KERN Handheld Refractometer KERN ORL 94BS

Digital measurement of refraction index for universal application

Technical Data ORL 94BS

Area of application Basic measurements for Brix and refractive index
Measuring method Total reflection
Measurement temperature (°C) 0 °C – 40 °C
Automatic temperature compensation (ATC)
IP protection - complete device IP43
Dimension (W×D×H) 180×100×55 mm
Brix scale
Measuring range Brix 0 % – 94 %
Readout Brix 0,1 %
Scale for Refractive index
Measuring range refractive index 1,3330 nD – 1,5290 nD
Readout refractive index 0,0001 nD
€801.00 Regular price €890.00
KERN KERN ORM 1WN refractometer wine

Model
Scales
Measuring
range
Accuracy
Division
ORM 1WN
Brix
Oechsle
KMW (Babo)
Volume percent
0,0 % - 50,0 %
0,0 °Oe - 150,0 °Oe
0,0 °KMW - 25,0 °KMW
0,0 %(v/v) - 22,0 %(v/v)
0,2 %
2 °Oe
0,2 °KMW
0,2 %(v/v)
0,1 %
1 °Oe
0,1 °KMW
0,1 %(v/v)

The following models are particularly suitable for the measurement of the content of sugar in fruits. It indicates the expected °Alcohol of the fruit. The degree of ripeness of fruit (fruit-sugar) can also be determined, such as e.g. grapes. Alternatively the display can be switched to show Brix or the refractive index.

Main areas of application:

  • Agriculture: Wine and fruit cultivation
  • Wine production
  • Must and alcohol production
€333.00 Regular price €370.00
KERN KERN ORM 1BR refractometer beer

Model
Scales
Measuring
range
Accuracy
Division
ORM 1BR
Refractive index
Brix
Original wort (beer)
Plato
1,3330 nD - 1,4200 nD
0,0 % - 50,0 %
1,000 SG Wort - 1,130 SG Wort
0,0 °P - 30,5 °P
0,0003 nD
0,2 %
0,002 SG Wort
0,3 °P
0,0001 nD
0,1 %
0,001 SG Wort
0,1 °P

The following models are particularly suitable for determining the sugar content of the original wort of beer in its unfermented state. The value can be read straightaway, without having to be converted, using the SG Wort and Degrees Plato scales. In addition, the percent by volume and percent by mass scales can be used to determine the alcohol content of clear spirits. Alternatively the display can be switched to show Brix or the refractive index.

Main areas of application:

  • Beer brewers
  • Alcohol production
€333.00 Regular price €370.00
KERN KERN ORM 1AL Rifrattometro portatile per alcol

  • This model is particularly suitable for determining the alcohol (Percent by mass) content of clear spirits. Alternatively the display can be switched to show Brix or the refractive index.
  • Main scope of applications:
    - Alcohol production
Area of application Alcohol
Measuring method Total reflection
Measurement temperature (°C) 0 °C – 40 °C
Automatic temperature compensation (ATC)
IP protection - complete device IP65
Dimension (W×D×H) 121×58×25 mm
Brix scale
Measuring range Brix 0 % – 50 %
Readout Brix 0,1 %
Scale volume percentage
Measuring range volume percentage 0 % – 80 %
Readout volume percentage 1 %
Scale percent by mass
Measuring range percent by mass 0 % – 72 %
Readout percent by mass 1 %
Scale for Refractive index
Measuring range refractive index 1,3330 nD – 1,4200 nD
Readout refractive index 0,0001 nD
€333.00 Regular price €370.00
KERN KERN ORM 1CO Refractometer coffee

Model
Scales
Measuring
range
Accuracy
Division
ORM 1CO
Refractive index
Brix
Coffee TDS 1
1,3330 nD - 1,4200 nD
0,0 % - 50,0 %
0,0 - 25,0
0,0003 nD
0,2 %
0,2
0,0001 nD
0,1 %
0,1

The following models are particularly suitable for measuring the dissolved solids (TDS) in coffee to determine or compare the strength of a cup of coffee. For roasting plants, the TDS% value is used to determine the solubility level of a roast and to control the quality. Alternatively the display can be switched to show Brix or the refractive index. Alternatively the display can be switched to show Brix or the refractive index.

Main areas of application:

  • Coffee industry
  • Coffee roasting plants
  • Coffee competitions
€333.00 Regular price €370.00
KERN copy of KERN ORM 1CO Refractometer coffee

Model
Scales
Measuring
range
Accuracy
Division
ORM 2CO
Refractive index
Brix
Coffee TDS 2
1,3330 nD - 1,4200 nD
0,0 % - 30,0 %
0,0 - 25,0
0,0003 nD
0,2 %
0,2
0,0001 nD
0,01 %
0,01

The following models are particularly suitable for measuring the dissolved solids (TDS) in coffee to determine or compare the strength of a cup of coffee. For roasting plants, the TDS% value is used to determine the solubility level of a roast and to control the quality. Alternatively the display can be switched to show Brix or the refractive index. Alternatively the display can be switched to show Brix or the refractive index.

Main areas of application:

  • Coffee industry
  • Coffee roasting plants
  • Coffee competitions
€333.00 Regular price €370.00
KRÜSS Refractometer calibration liquid with certificate nD 1.3400

for refractive index nD 1.3400 (25°C) - 30 ml

  • nD 1.3400 ±0.0002 at 25°C, temperature coefficient -0.000338/+°C, 5%Brix
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration solution with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00
KRÜSS Digital handheld refractometer KRÜSS DR101-60

KRÜSS DR101-60 is a compact, mobile and splash-proof digital handheld refractometer. Thanks to the automatic temperature compensation for the BRIX scale, a reproducible measurement can be achieved even under changing ambient conditions. As a waterproof device, the DR101-60 meets the IP65 standard and can be cleaned under running water. The DR101-60 is used in the food and beverage industry, in pharmacies, laboratories and testing laboratories as well as in research and teaching.

  • Measurement range: nD 1.3330-1.4419 and 0-60%Brix
  • Mobile automatic measurement at the touch of a button
  • Reproducible measurement results that are not dependent on the user’s interpretation.
  • Automatic temperature compensation (BRIX scale)
  • Swift filling and cleaning
  • With high-quality, fully chrome-plated measurement tray
  • Robust housing and low device weight
€289.00
KRÜSS Digital handheld refractometer KRÜSS DR201-95

KRÜSS DR201-95 is a compact, mobile and splash-proof digital handheld refractometer. It is used to measure the refractive index (nD) and the sugar content in % (%Brix) of liquid and viscous samples. Thanks to the automatic temperature compensation for the BRIX scale, a reproducible measurement can be achieved even under changing ambient conditions. The automatic temperature compensation for the BRIX scale supports the user when measuring sugary drinks and confectionery. The device is splash-proof and meets the IP64 standard. The DR201-95 is used in the food and beverage industry, in pharmacies, laboratories and testing laboratories as well as in research and teaching.

Basic functions

  • Measurement range: nD 1.3330-1.5318 and 0-95%Brix
  • Mobile automatic measurement at the touch of a button
  • High measurement accuracy: nD ±0.0003 and ±0.2 %Brix
  • Reproducible measurement results that are not dependent on the user’s interpretation.
  • Automatic temperature compensation (BRIX scale)
  • With high-quality, fully chrome-plated measurement tray
€415.00
KRÜSS Handheld refractometer KRÜSS DR301-95

The DR301-95 is both a high-quality mobile handheld device and digital desktop device. In addition to the refractive index and sugar content, it can also measure the salt content (‰ ) (NaCl). Via the menu control it is possible to switch on the automatic temperature compensation for each scale – with measurement reference to sucrose. An alarm option can be set up for monitoring limit values in production processes. The supplied Mains adaptor turns the DR301-95 into a small laboratory refractometer. In mobile use, it is operated with a 9 V block battery. The DR301-95 is used in the food and beverage industry, in pharmacies, laboratories and testing laboratories as well as in research and teaching.

  • Measurement range: nD 1.3330-1.5318 and 0-95%Brix
  • High measurement accuracy: nD ±0.00015 and ±0.1 %Brix
  • Can also be used to determine the salt content (‰ )
  • Reproducible measurement results that are not dependent on the user’s interpretation.
  • With high-quality, fully chrome-plated measurement tray
  • Operation possible with Mains adaptor or battery
€935.00
KRÜSS Refractometer calibration liquid with certificate nD 1.3900

for refractive index nD 1.3900 (25°C) - 30 ml

  • nD 1.3900 ±0.0002 at 25°C, temperature coefficient -0.000344 /+°C, 35%Brix
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration solution with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00
KRÜSS Refractometer calibration liquid with certificate nD 1.4300

for refractive index nD 1.4300 (25°C) - 30 ml

  • nD 1.4300 ±0.0002 at 25°C, temperature coefficient -0.000400/+°C, 55%Brix
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration solution with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00
KRÜSS Refractometer calibration liquid with certificate nD 1.4800

for refractive index nD 1.4800 (25°C) - 30 ml

  • nD 1.4800 ±0.0002 at 25°C, temperature coefficient -0.000395 /+°C, 76%Brix
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration solution with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00
KRÜSS Refractometer calibration liquid with certificate nD 1.5300

for refractive index nD 1.5300 (25°C) - 30 ml

  • nD 1.5300 ±0.0002 at 25°C, temperature coefficient -0.000409/+°C
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration liquid with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00
KRÜSS Refractometer calibration liquid with certificate nD 1.5800

for refractive index nD 1.5800 (25°C) - 30 ml

  • nD 1.5800 ±0.0002 at 25°C, temperature coefficient -0.000428+°C
  • Traceable to an internationally recognized standard according to N.I.S.T.
  • Calibration liquid with defined measured value and certificate at 25°C.
  • Each bottle is equipped with temperature correction information. The setpoints for temperatures deviating from 25°C are easy to calculate individually.
  • The standard is very inert and guarantees a long shelf life of 5 years unopened. After opening the 30ml bottle, half of the remaining time is considered the expiration date.
  • Consists of aliphatic / alicyclic hydrocarbons that are easy to clean with water or standard laboratory solvents, leaving no residue.
  • Substance is very attractive in terms of occupational safety. Classification as: not acutely toxic, not irritant, not serious eye damage, not mutagenic or carcinogenic, not toxic for reproduction. Should not get into the groundwater.

Price per 100 ml = 816,67 €

€245.00