The Aven 26800C-541 handheld shop-type microscope has a magnification ability of 40X, with 4.0 mm FOV, built-in LED illumination, and a focus wheel. This microscope enhances object or image resolution, and is commonly used by hobbyists and professionals in the printing, engineering, dermatology, parts assembly, quality control (QC) inspection, collecting, printing, gemology, and medical industries. This microscope features a focus wheel that allows detailed examination with pointed accuracy for inspection of small areas and objects. It has built-in, LED illumination with the ability to be switched on and off. The microscope has a built-in scale with 0.05 mm graduations. A clear acrylic stand allows ambient light to the object. The unit works with 3 AAA batteries (not included). Specifications Optical magnification 40X Lens material Glass Illumination Built-in LED, with ability to be turned on and off Field of view (FOV) 4.0 mm Scale Built-in, with 0.05 mm graduations Measurement range 2 mm Eyepiece dimension 0.25-inch outer diameter (OD) Stand Clear, acrylic Overall dimensions 127 x 20 mm / 5.0 x 1.0 inches (H x W) Weight 3.2 oz. Illumination power source 3 AAA batteries (not included) *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. 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 viewing abilities. A trinocular eyepiece is used to output digital images to an internal or external device such as a camera or monitor. 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 use 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. Aven manufactures optical inspection tools, precision tools, and bench accessories for industrial, scientific, and research applications. The company was founded in 1983 and is headquartered in Ann Arbor, MI. What’s in the Box? 26800C-541 microscope Instructions