K20 Force Tensiometer

K20 Force Tensiometer is a stand-alone, semi-automatic instrument for all routine quality control tasks involving surface tension and interfacial tension.

K20 Force Tensiometer

K20 Force Tensiometer is a stand-alone, semi-automatic instrument for all routine quality control tasks involving surface tension and interfacial tension.

Manufacturer KRUSS
Product Series KRUSS Tensiometer
Measurement principle Surface tension and interfacial tension and density
Application Surface Tension - Contact Angle
Temperature range ‑10 and 130 °C

Product Overview

The KRUSS K20 Force Tensiometer is a robust, semi-automatic instrument for the precise measurement of surface tension and interfacial tension. It produces reliable results for the routine quality assurance of surfactant solutions and interfacial processes. K20 can also be used to determine the density of liquids.

Stand alone tensiometer for QC

Using a precision force sensor together with a high quality Du Nouy ring and Wilhelmy plate the K20 measures surface tension and interfacial tension based on the wetting force acting on the measuring probe. In addition to its compact size and low weight, the optional long-life battery operation and integrated memory allows the K20 to be used as a stand alone system on site.

Simple, semi-automatic measurement

Samples can be quickly set up and positioned using simple manual operation of the sample stage and the large illuminated sample chamber. Measurements can be performed using pre-prepared programs which move the motorised sample stage automatically, while the speed and other measurement parameters can be adjusted to suit. This enables the measuring sequence to be easily optimised for the upper or lower measuring range of surface and interfacial tension. The accuracy of the measurement is enhanced by the magnetically locking windshield which prevents the effect of air currents.

Equipment for flexible measuring conditions

The optional thermostat jacket for the K20 enables process conditions for temperatures between ‑10 and 130 °C to be simulated, e.g the addition of surfactant can be optimised for a particular technical process. With dispersions, an integral magnetic stirrer ensures that the sample is uniformly mixed before the measurement is carried out. The measuring results, together with all important parameters and data relating to the measurement, can be transferred to the software for further analysis. Alternatively, the report containing the results can be printed at the press of a button.

  • Demonstration video
  • Benefits
  • Applications

Demonstration video


  • Measure surface and interfacial tension as well as density of liquids
  • Fast and easy to use in Quality Control
  • Semi-automatic measurement programs for reproducible conditions
  • Rapid measurement preparation
  • Intelligent processor-supported measurement sequences
  • Stand alone operation with long battery life
  • Temperature control accessories for process oriented analysis


  • Determination of the effectiveness of wetting agents
  • Checking the surfactant content in solutions below the critical micelle concentration (CMC)
  • Tank clearance and cleaning validation in the foodstuffs industry
  • Measurement of interfacial tension for the quality assurance and optimisation of emulsifiers, paints, inks and varnishes
  • Analysing the aging status of oils according to ASTM D971 and IEC 62961
  • Investigate wetting of immersion molds and into dispersion and emulsion stability in the production of latex

Product Enquiry


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