The AmScope SW3T24Z trinocular stereo microscope head has a 2x/4x objective, a pair of 10x20mm widefield higheyepoint eyepieces, a 2.0x Barlow lens, and a singlearm boom stand. The microscope head has a 3 Oring style mounting ring. The trinocular viewing head has an interpupillary range of 47 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 WF10x20mm superwidefield higheyepoint eyepieces combine with the 2x/4x objective to provide 20x, 40x, and 80x magnification, and a longer working distance for inspecting largescale specimens that require handling or repair. The microscope includes a 2.0x Barlow lens that can be added to the objective to increase the magnification range. A Barlow lens with a magnification greater than 1.0 increases the magnification and reduces the working distance. Higheyepoint eyepieces ease viewing for users who wear glasses, dioptric adjustment accommodates individual eyestrength differences, and eye guards ensure comfortable viewing. The optical glass lenses provide sharp images, and are fullycoated to ensure highresolution images. 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 Yaxis. 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). SpecificationsHeadTrinocularMagnification20x, 40x, 80xObjective power2x/4xEyepieces (30mm)WH10x20mmTrinocular portCMount or 23mmOptical working distanceUp to 4Field of view0.787 at 10xMicroscope 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? Trinocular stereo zoom head with 2x/4x objective WH10x eyepieces, one pair 2.0x Barlow lens Singlearm boom stand with focus rack Eye guards, one pair