| Model |
Theta Flow |
Theta Flex |
Theta Lite |
|---|---|---|---|
 |
 |
 |
|
| Available Measurements | |||
| Static Contact Angle | Yes | Yes | Yes |
| Dynamic Contact Angle | Automatic | Automatic | Manual |
| Surface / Interfacial tension | Yes | Yes | Yes |
| 3D surface roughness | Yes | Yes | – |
| Interfacial rheology | Yes | Yes | – |
| Surface free energy | Zisman Plot, OWRK/Extended Fowkes, van Oss Acid-Base, Wu, Neumann’s Equation of State, Schultz 1 and 2 | ||
| Available Measurement Methods | |||
| Sessile drop | Yes | Yes | Yes |
| Captive bubble | Yes | Yes | Yes |
| Pendant drop | Yes | Yes | Yes |
| Reverse pendant drop | Yes | Yes | Yes |
| Meniscus | Yes | Yes | Yes |
| Dynamic contact angle | Automatic | Automatic | Manual |
| Pulsating drop | Yes | Yes | – |
| 3D Topography | Yes | Yes | – |
| High Pressure | Yes | Yes | – |
| Hardware | |||
| Measuring range (°, mN/m) | 0 – 180, 0.01 – 2000 | 0 – 180, 0.01 – 2000 | 0 – 180, 0.01 – 2000 |
| Accuracy (°, mN/m) | ±0.1, ±0.01 | ±0.1, ±0.01 | ±0.1, ±0.01 |
| Maximum sample size (mm) | Unlimitedx100x320 | Unlimited×100×320 (with stage) | Unlimited×45×200 (with stage) |
| Maximum resolution (px) | 2592×2048 | 1984×1264 | 1280×1024 |
| Maximum measuring speed (fps) | 3422 | 3009 | 2068 |
| Camera | USB 3.0 digital camera with zoom | USB 3.0 digital camera with zoom | USB 3.0 digital camera |
| Image focusing | Software-controlled autofocus, manual fine focus in optics | Manual fine focus in optics | Manual fine focus by optical rail |
| Image quality | Enhanced with DropletPlus technology, Native | Native | Native |
| Light source | LED based homogeneous background lighting | LED based homogeneous background lighting | LED based background lighting |
| Field of view (Ø, mm) | 1.44 – 45.3 | 1.44 – 32.3 | 2.9 – 12 |
| Integrated touch display | Yes | – | – |
| Environment monitoring | Yes | – | – |
| Dimensions — Basic frame (L×W×H, cm) | 76.5x23x43.5 | 76.5×23×43.5 | 49.5×13×31 |
| Weight — Basic frame (kg) | 29 | 26 | 5 |
| Power supply (VAC) | 100 – 240 | 100 – 240 | 100 – 240 |
| Frequency (Hz) | 50 – 60 | 50 – 60 | 50 – 60 |
| Drop Profile Fitting Method | |||
| Young-Laplace (CA, ST/IT, M)* | Yes | Yes | Yes |
| Bashforth-Adams (ST/IT)* | Yes | Yes | Yes |
| Circular (CA)* | Yes | Yes | Yes |
| Polynomial (CA, M)* | Yes | Yes | Yes |
| Software | |||
| Provided software | OneAttension | OneAttension | OneAttension |
| System Requirements | |||
| Recommended system requirements |
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| Operating system requirements |
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| Learn more | View Attension Theta Flow | View Attension Theta Flex | View Attension Theta Lite |
CA: Contact angle | ST/IT: Surface tension and Interfacial tension | M: Meniscus