This unit was acquired in a dealer liquidation sale and is like new; it may be new or was possibly used as a demonstrator.  The specifications are as follows:

The Alpha Stereo Binocular Microscope utilizes Vision Engineering's patented ISIS Exit Pupil Expansion technology to provide up to 10 times greater freedom of head position than conventional binocular eyepiece systems.  ISIS technology expands the available optical pupil by means of multi-lenticular optical surfaces, allowing the operator more than 38mm of head freedom from the eyepieces.

Alpha eliminates the need for users to precisely align their eye with the center of each eyepiece. A small movement of the eye no longer means losing part of the field of vision, as the pupil easily stays within the latitude of the twelve-times-wider exit ray bundle.  Users can simply move their eyes to view the full image area, rather than repositioning their heads or the workpiece to operate within the constraints of a narrow conventional exit field.  Spectacles or contact lenses can thus be worn in comfort during use.

The unit pictured is complete with dual 45º reflected light illumination.  The optical zoom is 7X to 40X.