3.5X-45X Trinocular Stereo Microscope on Ball Bearing Boom Stand 3.5X-45X zoom microscope on ball-bearing boom stand Super widefield optics w/ crisp clear stereo images Ball-bearing stand offering effortless moving adjustments 2-1/2" (65mm) field view and 8" (200mm) working distance Trinocular Port for adding photo / video capability