OMAX 2.1X-225X 18MP USB3.0 Digital Stereo Microscope on Articulating Arm with 30W LED Dual Light Total magnification: 2.1X-225X; Microscope body - Trinocular 360 degrees rotatable viewing head - 45 degrees inclined ocular tubes - Diopter adjustment rings on both ocular tubes - Interpupillary distance adjustable: 47 - 73mm ( 1-3/4inch - 2-3/4inch ) - Inner diameter of ocular tube: 30mm -Inner diameter of photo tube: 23.2mm - Mounting size for auxiliary lens: 48mm female thread (M48X0.75); Eyepiece - A pair of high eyepoint widefield WF10X/20 - A pair of widefield WF25X Objective - Zoom 0.7X - 4.5X - Zoom ratio 6.4:1; Auxiliary Objectives - 0.3X auxiliary objective - 2.0X auxiliary objective; Working distance - Max. 100mm (3-15/16inch) with no auxiliary objective lens - Max. 230mm (9-1/16inch) with 0.3X auxiliary objective lens; Field of view - Max. 30mm (1-3/16inch) with no auxiliary objective lens - Max. 86mm (3-3/8inch) with 0.3X auxiliary objective lens; Articulating arm boom stand - Table clamp: Max. opening 62mm ( 2.4inch ) Articulating arm: Spring loaded for easy operating, multi-arm provides more flexibility - 360 degrees rotating horizontally - Radius of working area: Max. 1040mm ( 41inch ) - Diameter of microscope body holder: 76mm ( 3inch ) - Focus block: rack and pinion adjustment, range 55mm (2-5/32inch); Illumination - 30W LED illumination supply - Fiber optic dual gooseneck attachment, length 56cm ( 22inch ) - Power input: AC 100V - 240V Digital camera: - true color 4912x3684 pixels (18M pixels) - Super speed USB 3.0 connection - 0.5X reduction lens to get larger field of view - 0.01 mm calibration slide: 1mm/100 division - Frame speed: 5.6fps at 4912x3684, 18.1fps at 2456x1842, 32.2fps at 1228x922 - Software compatible with Windows, Mac OS X and Linux operating systems - Capturing microscope images, recording live video, measuring lengths, angles, areas, editing images - USB3 cable included 5-year warranty against manufacturing defects