The outer casing of the microscope is metal which is stable in structure and protects the internal structure from damage, and greatly improves the service life. The compacts and practical makes the diaphragm work more stably. The of the diaphragm can reach 26mm, and the light transmittance is strongers, which can make the observed object clearer and brighter without receiving external light sources. Compared with using a small hole to pass through the the convenience of use is greatly improved. The adjustable is 1.5mm-26mm, and the dynamic adjustment ranges is wide. A single original can be used in multiple scenes, and it get rid of the burden of needing multiple sets of apertures due to inappropriate apertures, making it more to use. The of this microscope can be changed through the handle, which is easy to operate, compacts and easy to carry, and is a very practical laboratory accessory.