Features: Need a Sturdy Boom Stand for reduced Vibration and Optimal Versatility? This stand provides what is needed! We provide the boom stand only. This is not a complete system. A microscope head with optics is needed. You provide the head. We have several types of adapters to fit a variety of microscope heads. Contact us for details about your specific requirements so we can assist with a smooth fit. Easy Large-Sized Focusing Knobs on Both Sides of Focusing Holder. Steel Gears on Focusing Holder. Standard Size Focusing Holder - Will Fit Scope Heads with Diameter of 50mm Item size: see the 1th picture Weight: 2.6kg C-MOUNT Lens: Objective: continuous zoom 0.7-4.5X, Zoom ratio: 6.4:1 Eyepiece: 0.5X (optional 0.35X/1X/2X) Objective: 1X (optional 0.5X, 2X) Zoom range: 260X - 2X. With auxiliary Objective: 0.3X, 0.5X, 0.75X, 1.0X, 2.0X Working distance: standard working distance 100mm, can be extended to 100mm. - 200mm Focusing mechanism: adjustable focusing hand wheel, focusing range 63mm and 50mm Package Including: 1 x Digital Microscope Table Stand 1 x C-MOUNT Lens