Also known as mineralogical microscope or mineral microscope, it is an essential instrument for studying and identifying substances with birefringence using the polarization characteristics of light. It can be used by a wide range of users for single polarization observation, orthogonal polarization observation, and cone light observation. Widely used in research and testing in fields such as geology, chemical engineering, medicine, and pharmaceuticals, it can also observe the crystal phase of liquid polymer materials, biopolymers, and liquid crystal materials. It is an ideal instrument for research institutions and higher education institutions to conduct research and teaching.