The AmScope SM-1BSX-64S professional stereo zoom microscope has a pair of 10x super-widefield high eyepoint eyepieces a 0.7x-4.5x zoom objective a 0.5x Barlow lens and a pillar stand. The microscope has an overall magnification range of 3.5x-45x. The binocular viewing head has an interpupillary range of 55 to 75mm a 45-degree inclination to reduce eye and neck strain and 360-degree rotation to enable sharing. The WH10x20mm super-widefield high-eyepoint eyepieces combine with the 0.7x-4.5x zoom objective to provide 7x-45x continuous zoom magnification and a longer working distance for inspecting large-scale specimens that require handling or repair. High-eyepoint objectives ease viewing for users who wear glasses and dioptric adjustment accommodates individual eye-strength differences. The microscope includes a 0.5x Barlow lens that can be added to the objective to decrease the magnification to 3.5x-22.5x. A Barlow lens with a magnification of less than 1.0 reduces magnification and increases the working distance. 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. The removable 64-bulb LED ring light provides bright cool light for working with temperature-sensitive or live specimens. The ring light provides shadow-free illumination and a rheostat controls the amount of light emanating from the lamp. Power and adjustment controls are located on the light head. The light uses a 110V-240V variable power supply. The table stand has a reversible black and white stage plate that provides contrast with light- and dark-colored specimens and stage clips to secure the specimen in place. The stage plate has a 3-3/4 diameter (95mm). The stand is 10 x 7-7/8 x 10-3/4 inches/254 x 200 x 275mm (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). SpecificationsHeadBinocularMagnification range7x-45x continuous zoom; 3.5x-22.5x with Barlow lensZoom objective power 0.7x-4.5xEyepieces (DIN 30mm)WH10x20mm high-eyepointZoom range6.5:1Field of view range3/16 to 1-1/4 Optical working distance8 Microscope standPillarHead movementX-axisIllumination typeEpiscopic (reflected)Light source64-bulb led ring light with rheostatPower110V-240V Microscopes 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 three-dimensional 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. What s in the Box? AmScope SM-1BSX-64S stereo zoom microscope with pillar stand WH10x20mm eyepieces 30mm one pair 0.7x-4.5x zoom objective 0.5x Barlow lens 64-bulb LED ring light with power supply (LED-64S) Eye guards one pair Stage clips one pair Dust cove