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Contact Angle Analyzer [CA]

Theta Lite measures contact angle, surface free energy and drop volume. It can also measure surface tension and interfacial tension (optional). The available drop profiles are: sessile drop, pendant drop, meniscus, captive bubble and reverse pendant drop. Advancing and receding contact angles can also be studied if dispensing the liquid manually. It comes with manual sample stage and manual liquid dispenser, making it a convenient entry level instrument for research, industrial processes and educational use.       

Contact person:

Kokkoni Karakosta
tel. (+30) 2510462247
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KSV Nima TL101



Theta Lite is a compact and robust optical tensiometer for simple and precise measurements of:

  • contact angle
  • surface free energy
  • surface and interfacial tension
  • wettability
  • adsorption
  • spreading
  • cleanliness
  • surface heterogeneity
  • Measuring with Theta Lite

Theta Lite open design enable users to easily manipulate samples and have easy access to the different part of the instruments, thus contributing to a pleasant user experience.

As an optical method, the measurement precision of optical tensiometers depends on the quality of the pictures and the analysis software. Attension optical tensiometers utilize a unique monochromatic cold led light source as well as a smooth lighting integrating sphere to minimize undesirable sample evaporation. Image quality is guaranteed by a state-of-the-art high-resolution digital camera and a high speed data transfer between the computer and the instrument.

The optical tensiometer software, OneAttension, enables superior analysis of drop shapes, using for instance the Young-Laplace equation which is able to fit the entire drop profile and is the reference method, first brought to optical tensiometers by Attension. It complies with the promise of performance and simplicity:

  • Automatic base line detection and drop shape fitting
  • Contact angle on curved surfaces (circular or near-circular)
  • Flexible and programmable frame per second rate recorded by the camera
  • Parameters and experimental settings such as material and liquid used can be saved as recipes for further use

OneAttension is an all-inclusive software enabling immediate access to all measurement capabilities with no need to purchase and install separate software modules. It features an intuitive user interface, live analysis, configurable user groups and accounts and a preset liquid database. Any datapoints or groups of datapoints can be selected, transformed, plotted and analyzed. Data can easily be exported. In-depth analysis is now just a matter of seconds.

Measuring chambers, cuvettes and other accessories are available to add capabilities to your Theta Lite.

Technical specifications 


Theta Lite

Measuring range

0...180°, 0.01...999 mN/m


± 0.1°, 0.01 mN/m

Maximum sample size

W unlimited x L 200 x H 50 mm

(with stage)

Frame interval

17 ms ... 1000 s


640 x 480 pixels

Max. measuring speed

60 frames/s


Firewire digital camera

Light source

LED based background lighting


H 310 mm, W 130 mm, L 495 mm

Weight (basic frame)

5 Kg

Power supply

100...240 VAC


50...60 Hz