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A stereo microscope, also known as a dissecting microscope or a stereoscopic microscope, is a type of microscope that uses two separate optical paths to provide a three-dimensional view of the object being observed. Stereo microscopes are commonly used in biology, electronics, geology, and other fields where a three-dimensional view of the sample is needed.

The two optical paths in a stereo microscope use separate objective lenses to produce two slightly different images of the sample. These images are then combined in the eyepieces to produce a single three-dimensional image with depth perception.

Unlike compound microscopes, which are used to observe thin, transparent specimens, stereo microscopes are used to examine larger, opaque specimens that cannot be viewed under high magnification with a compound microscope. Stereo microscopes typically have lower magnification than compound microscopes, usually between 10x and 50x, but they provide a larger field of view and a wider depth of field, allowing the observer to see more of the sample at once.

Stereo microscopes come in a variety of designs, including binocular and trinocular models, with different levels of magnification and illumination options. They are widely used in biological research, manufacturing, quality control, and other fields where a three-dimensional view of the sample is essential.