A biological microscope is a precision optical instrument used to observe biological sections, biological cells, bacteria, living tissue culture, fluid precipitation, and other transparent or translucent objects, powder, fine particles, and other objects. Biological microscopes are used by hospitals, universities, and research institutes for the observation of microorganisms, cells, bacteria, tissue culture, suspensions, sediments, etc. They can continuously observe the process of cell and bacteria reproduction and division in culture media. It is widely used in the fields of cytology, parasitology, oncology, immunology, genetic engineering, industrial microbiology, botany, and so on. The optical technical parameters include: numerical aperture, resolution, magnification, depth of focus, field width, coverage difference, working distance, etc.