AmScope SM-4TZ-56S Professional Trinocular Stereo Zoom Microscope, WH10x Eyepieces, 3.5X-90X Magnification, 0.7X-4.5X Zoom Objective, 56-Bulb LED Ring Light, Double-Arm Boom Stand, 110V-120V, 110V-240V, Includes 0.5X and 2.0X Barlow Lens Professional stereo microscope with boom stand has long working distance to enable users to perform work or manipulate large items, including circuit boards and dental appliances Trinocular viewing head with pair of 10x super-widefield eyepieces, adjustable interpupillary distance, fixed 45-degree vertical inclination to reduce eye and neck strain, and 360-degree rotation capability to enable sharing 0.7x-4.5x zoom objective provides continuous zoom magnification and longer focal length for inspecting large-scale specimens, a 0.5x Barlow lens extends the working distance, and a 2.0x Barlow lens extends the magnification range Removable rheostat-controlled 56-bulb LED ring light provides intensity control and bright, cool light for working with temperature-sensitive or live specimens Double-arm boom stand has 20" arms and 17" pillar to enable users to position the microscope head on three axes (X, Y, and Z)