With Stereo Zoom Microscopes once the specimen is brought into focus you can change the magnification to suit your needs without refocusing, The SMZ is versatile enough for educational industrial or medical use in agriculture geology archeology or biology fields, Features Vertical eyepiece tube for photography Third 10X eyepiece not included 3D System is infinitely variable 10X Widefield Eyepieces with rubber eyeguards Binocular observation tubes inclined 45 degrees Head able to rotate 360 degrees Interpupillary distance adjustable 55mm to 77mm Horizontal zoom controls at each side of head 1X to 4X objectives total magnification 10X to 40X Field of view ranges from 23mm to 5, 5mm diameter 85mm working distance 20W Halogen transmitted illuminator under 75mm frosted glass stage plate 20W Halogen incident top illumination 3-Way power switch allows incident lighting transmitted lighting or both UL approved Dust cover and spare bulb and black and white contrast plate Size Dimensions - 6, 75 x 9, 5 x 20 inches CE certified SKU: CAS183