Binocular Stereo-Zoom 23mm Microscopes offer superior convenience and uncompromising optical quality. A 26" stainless steel horizontal boom extension and 19.5" vertical boom are mounted to a 10" die-cast base. Ball-Bearing design allows fluid horizontal extension of the boomstand. Extensive flexibility and adjustability allow this microscope to alter angles up to 45?; the head can be rotated 560? in its focus mount. These 23mm microscopes offer an 8" working distance and 15% greater field of view than comparable Luxo System 250 models. Microscrope magnification range of 7X to 45X.