The AmScope SM3T professional stereo zoom microscope has a pair of 10x superwidefield higheyepoint eyepieces, a 0.7x4.5x zoom objective, and a singlearm boom stand. The microscope has an overall magnification range of 7x45x. The trinocular viewing head has an interpupillary range of 55 to 75mm, a 45degree inclination to reduce eye and neck strain, and 360degree rotation to enable sharing. The vertical trinocular port can be used as a CMount or 23mm photo port (camera sold separately). The WH10x20mm superwidefield higheyepoint eyepieces combine with the 0.7x4.5x zoom objective to provide continuous zoom magnification and a longer working distance for inspecting largescale specimens that require handling or repair. Higheyepoint eyepieces ease viewing for users who wear glasses, and dioptric adjustment accommodates individual eyestrength differences. A stereo microscope, sometimes called an inspection or dissection microscope, has low magnification and a long working distance that enables users to manipulate the object being inspected.Ambient lighting illuminates the specimen, eliminating the need for power or batteries. The microscope has a 17 pillar that has an 8 vertical working distance. The 16 singlearm boom has a 24 overall length. Bilateral focus eases use for left and righthanded users. The microscope head can be rotated on the X and Yaxes. The solid caststeel base is 13/4 x 9 x 9 inches (H x W x D, where H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back). SpecificationsHeadTrinocularMagnification range7x45xZoom objective power0.7x4.5xEyepieces (DIN, 30mm)WH10x20mm higheyepointTrinocular portCMount or 23mmField of view11/4Optical working distanceUp to 4Microscope standSinglearm boom standHead movementX and YaxesIllumination typeN/ALight sourceAmbientPowerN/AMicroscopes are instruments used to enhance the resolution of an object or image. Types include compound, stereo, or digital. Compound microscopes use a compound optical system with an objective lens and an eyepiece. Stereo microscopes show object depth in a threedimensional image. Digital microscopes are used to display an image on a monitor, rather than looking through a lens. Microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces, with varying magnification abilities. Magnification ability refers to the size of an image. Resolution, also known as resolvant power, refers to the clarity of the image. The interaction between field of view (FOV), numerical aperture (NA), and working distance (WD) determines resolution. Microscopes can control magnification through a fixed focus, or through a range of adjustments. They can also utilize LED, fluorescent, and mirror light sources to help control viewing capabilities. Microscopes are widely used in education, lab research, biology, metallurgy, engineering, chemistry, manufacturing, and in the medical, forensic science, and veterinary industries.United Scope manufactures microscopy equipment and accessories under the brand name AmScope. The company, founded in 1996, is headquartered in Irvine, CA. Whats in the Box? AmScope SM3T stereo zoom microscope with singlearm boom stand WH10x20mm eyepieces, 30mm, one pair 0.7x4.5x zoom objective Focus rack Eye guards, one pair Instructions