Refractometers

Refractometers from KERN enable precise measurements of the refractive index – ideal for determining concentrations, densities, or sugar and salt content in liquids. Whether in laboratories, the food industry, or the medical field: the various models offer reliable results and user-friendly operation for professional requirements.

Refractometers – Precise Analytics for Laboratories, Industry and Food Production
 
Refractometers are high-precision optical measuring instruments used to determine the refractive index of various media. From this value, essential parameters such as concentration, density, and the alcohol, sugar, or salt content can be calculated. Whether for quality control in food production, laboratory analysis, or artisanal use – refractometers from KERN deliver reliable measurement results for a wide range of applications.
 
Wide Product Range – The Right Device for Every Application
The KERN portfolio includes analog and digital refractometers, as well as special models for specific media:
Analog handheld refractometers: Ideal for mobile use in agriculture, food inspection, or education. Compact, robust, and easy to use.
Digital refractometers: For precise analysis with digital display and automatic temperature compensation (ATC). Battery-powered for flexible use – whether in the lab, production line, or field service.
Special refractometers: Developed for specific applications, e.g., for analyzing urine, industrial oils, or coolants.
 
Versatile Applications – From Honey to Jewelry
Refractometers can be used in a wide range of industries:

• Food and beverage production: Monitor sugar content (Brix), alcohol levels, or salt concentration
• Beekeeping & honey production: Determine moisture content in honey to assess quality
• Wine, cider, and beer production: Monitor fermentation and maturity
• Medical & veterinary fields: Analyze urine specific gravity for diagnostic purposes
• Agriculture & education: Use in agricultural schools or professional training
• Jewelers & gemology: Determine refractive indices for material analysis

 
Frequently Asked Questions (FAQ)
 
1. How does a refractometer work?
A refractometer measures the refractive index of a medium – in other words, how much light bends when it passes through a sample. The refractive index changes based on the composition and concentration. Many models feature automatic temperature compensation, since the index depends on temperature.
 
2. How do I use an analog refractometer?

• Open the cover and gently clean the prism with a soft cloth.
• Place a few drops of the sample on the prism.
• Carefully close the cover so the liquid spreads evenly.
• Hold it up to a light source and adjust the focus if needed.
• The result appears at the boundary line in the field of view.
• Clean and dry the prism after measurement.

 
3. What should I keep in mind when using a digital refractometer?

• Turn on the device (battery-powered, no power outlet required).
• Clean the testing surface and place the unit on a level surface.
• Apply a few drops of the sample onto the measurement surface.
• Start the measurement with the push of a button.
• The result appears digitally within seconds.
• Clean the test surface immediately after use. 

 
4. What should I know about maintenance & calibration?

• Refractometers require little maintenance, but careful handling is important:
• Prism cleaning: Use a dry or slightly damp cloth – never rinse under running water!
• Storage: Protect from shocks, extreme temperature changes, and aggressive vapors.
• Calibration: Many models remain stable over time, but can be easily calibrated if necessary – using distilled water or a reference solution.

 
Buy Your Refractometer Now!
Precision meets versatility – with a refractometer from KERN & SOHN, you get a robust and highly accurate measuring instrument that can be used flexibly across a wide range of industries. Our large selection of models ensures the right solution for every application.
Find your perfect refractometer today! Our experts are happy to assist you – contact us by
Phone: +49 (0) 7433 / 9933-562
Email: info.sauter@kern-sohn.com