A scanning electron microscope is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons.

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A scanning electron microscope is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons SEM Specimens can be observed in high vacuum in conventional SEM, or in low vacuum or wet conditions in variable pressure or environmental SEM, and at a wide range of cryogenic or elevated temperatures with specialized instruments SEM can achieve resolution better than 1 nanometer.