7x-45x Trinocular Stereo Zoom Microscope +3D Boom Stand 7X-45X continuous stereo zoom magnification power Super widefield optics provides crystal stereo erect images 1-1/4" (33mm) SUPER widefield of view and 4" (100mm) working distance 3D boom stand allowing point microscope head in any direction desired Trinocular port for adding photo/video capability