This Binocular Stereo Zoom Microscope features smooth-turning, dual, side-mounted zoom controls. Sturdy pod ring with set screw and 85mm I.D. Large knurled knobs drive rack and pinion, slip-clutch mechanism for easy, controlled focusing. Solid, stainless steel 165mm Pole Stand with 100mm travel. Black/white reversible stage plates included. 7X-45X.