It is the Multiskop, by Optrel GmbH, it works in extinction mode at single wavelength (632.8 nm).

Operational modes include:

• Null-ellipsometry (also on Langmuir monolayers, in liquid cell and/or variable temperature)
• Ellipsometric Imaging
• Brewster Angle Microscopy
• Total Internal Reflection Ellipsometry
• Plasmon Resonance

Here you find an tutotial on the basics of the ellipsotric technique.

You can also find a detailed description in [H.Harke, R. Teppner, O.Schulz, H.Orendi, H. Motschmann, Rev.Sci.Instrum. 68(8) August 1997]