This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

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Assuming that there is sufficient illumination, the smallest distance between two points that human eyes can resolve is about 0.1 - 0.25 mm, depending on how good their eyes are. This distance is the resolution or resolving power of our eyes. Therefore, any instruments that can show us pictures (or images) revealing details finer than 0.1 mm could be called as a microscope, and its highest useful magnification is governed by its resolution.