- 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
What you can measure
See it in action
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3 reasons to invest
Quick to learn
Standalone operations
Results in real-time
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A closer look
Dive into the specifics of Sigma 703D 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 |
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Available Measurements |
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Surface tension |
√ | √ | √ | √ | √ |
Interfacial tension |
√ | √ | √ | √ | √ |
Critical Micelle Concentration |
Automatic | Automatic | Manual | Manual | Manual |
Dynamic contact angle |
√ | √ | _ | _ | _ |
Surface free energy |
√ | √ | _ | _ | _ |
Powder wettability |
√ | √ | _ | _ | _ |
Density |
√ | √ | √ | √ | √ |
Sedimentation |
√ | √ | _ | _ | _ |
Balance Specifications |
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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 |
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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 |
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Temperature control range (° C) |
-20…+200 | -20…+200 | -20…+200 | -20…+200 | -20…+200 |
Stirrer |
√ | √ | – | – | – |
Software |
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Provided software |
OneAttension | OneAttension | Data receiver | Data receiver | Data receiver |
System Requirements |
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Recommended system requirements |
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Operating system requirements |
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Embedded Software and Data Receiver
Sigma 703D 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
Ready to measure right out of the box - Versatile data storage
Read the results onscreen, send them to PC or print them out with an optional printer - Precise
High end digital balance ensures your results are reliable
Add more possibilities
Check out accessories and modules available for Sigma 703. We selected a few favorites for you, but you can always find the complete 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 703 D for you. Find your pick amongst white papers and overviews.
- Attension

Surface and Interfacial Tension
- Attension

The Importance of Surface Tension in Industry
- Attension

Surface and Interfacial Tension
- Attension

Surface Tension and Surfactants in Industrial Processes
- Attension
