What you can measure

  • Surface tension
    Du Noüy ring and Wilhelmy plate methods
  • Interfacial tension
    Du Noüy ring method
  • Critical Micelle Concentration
    Manual measurements with Du Noüy ring and Wilhelmy plate methods
  • Density
    Density probe

See it in action

This short video will give you a quick view of how Attension Sigma 702 works as well as the main advantages of the force tensiometer. Watch the video in fullscreen for the best experience! 

3 reasons to invest

Quick to learn

This instrument has a simple and open design with an intuitive user interface. It is really quick to learn and keep on going. 

High precision

Thanks to the motorized sample stage and the ultrasensitive balance, surface and interfacial tension can be detected automatically and precise. An excellent fit for quality control and research. 

Results in real-time

Your results are displayed live on a large integrated screen. In other words, no need for an external computer. If you want to, you can easily print or export the results. 

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A closer look

Dive into the specifics of Sigma 702 and compare it to our other instruments to make a smart decision on what you need. 

Sigma 700
Sigma 701
Sigma 702
Sigma 702 ET
Sigma 703 D

Available Measurements 

Surface tension

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Interfacial tension

       √        √        √        √        √

Critical Micelle Concentration

 Automatic  Automatic  Manual  Manual  Manual

Dynamic contact angle

       √        √       _      _       _

Surface free energy

       √        √      _      _       _

Powder wettability

       √        √       _       _       _


       √        √        √        √        √


       √        √       _       _       _

Balance Specifications 

Measuring range (mN/m)

1…2000 1…2000 1…1000 1…1000 1…1000

Displayed resolution (mN/m)

0.001 0.001 0.01 0.01 0.01

Density range (g/cm3)

0…2.2 0…2.2 0…2.2 0…2.2 0…2.2

Density resolution (g/cm3)

0.0001 0.0001 0.0001 0.0001 0.0001

Maximum load (g)

210 5 5 5 5

Weighing resolution (mg)

0.01 0.005 0.01 0.01 0.01

Force resolution (µN)

0.1 0.05 0.1 0.1 0.1

Contact angle range (°)

0…180 0…180        –        –        –

Contact angle resolution (°)

0.01 0.01        –        –        –

Calibration & Locking

Automatic Manual Manual Manual Manual

Measuring Unit Specifications    

Sample stage

Motorized Motorized Motorized Motorized Manual

Sample stage speed (mm/min)

0.01…500 0.01…500 0.01…500 0.01…500        –

Stage positioning resolution (µm)

0.016 0.016 0.26 0.26        –

Dimensions (L×W×H, cm)

33.3×24.4×62 33.3×24.4×62 33.3×24.4×62 33.3×24.4×62 27.5×15.5×39.

Weight (kg)

16.3 13 10.7 10.7 4.9

Power supply (VAC)

85…264 85…264 85…264 85…264 100…240

Power consumption (W)

13 13 13 13 7

Frequency (Hz)

47…440 47…440 47…440 47…440 50…60

Common Accessories

Temperature control range (° C)

-20…+200 -20…+200 -20…+200 -20…+200 -20…+200


       √        √        –        –        –


Provided software

OneAttension OneAttension Data receiver Data receiver Data receiver

System Requirements 

Recommended system requirements

  • 1 GHz processor
  • 1 GB RAM
  • 40 GB hard disk drive (20 GB free)
  • 1 USB-port
  • Accessories such as water bath and liquid dispenser may require a free USB port

Operating system requirements

  • Windows 7 & 8 &10 (32 or 64 bit)
  • Windows Vista (32 bit)


Embedded Software and Data Receiver

Sigma 702 comes with a powerful embedded software that guides the user in the measurements and shows the results on the integrated screen. Data can be also stored in PC with Data Receiver software for additional data storage and reporting.

Software Features

  • Standalone
    Run the measurements and read the results onscreen
  • Intuitive and easy to run
    The software guides you in the measurement process
  • Versatile data storage
    Read the results onscreen, send them to PC or print them out with an optional printer
  • Automated
    Set the parameters and press start, everything else will be done for you


Add more possibilities

Check out accessories and modules available for Sigma 702. We selected a few favorites for you, but you can always find the whole list below. 


Platinum Du Nouy ring

Pt-Ir-ring made to fulfill the requirements at least in following standards; ISO 301, ISO 4311, ISO 6889, ASTM D1331 and ASTM D 971. Includes also additional weight for push-mode.


Platinum Wilhelmy plate

Platinum Wilhelmy plate with micro roughened surface.


Thermostatic vessel (from -20 to +200°C)

Chamber made from Teflon and Aluminum for temperature control of the sample liquid. A heat exchange vessel with fluid jacket type of construction. Heating/cooling of the fluid jacket requires external bath/circulator (T102ME or T102USB). Fits glass sample vessel 70 mm in diameter (T104). Operable temperature range from -20 to +200°C .


RS232-compatible printer

For printing results directly from instrument into paper.


What others say

Our instruments are present at many prestigious universities and research facilities world wide. Take a minute to find out what others say about our Sigma Instruments. 



Researcher at Riken, Japan

"We wanted the most accurate force tensiometer on the market for our research on surface tension. Our in-depth testing of the Attension force tensiometer convinced us: it is the one."


Riken, Japan

Riken is a Japanese research institute established in 1917. Its research areas include physics, chemistry, biology, medical science, engineering and computational science.


Learn more

We have gathered our in-depth knowledge associated with Sigma 702 for you. Learn more from our white papers and overviews.