In 1925, a polarizing microscope was introduced in Leica and has been serving for nearly a century in material microscopic testing and analysis. Leica, as the inventor of the polarizing microscope, always leads the way in the field of professional subdivision. Leica's polarizing microscope is a good choice for studying the crystal structure of materials such as minerals, plastics and polymers, pharmaceuticals, fuels, and bonding agents.

The Leica polarizing microscope currently widely used models are Leica DM4 P, Leica DM2700 P, and Leica Dm750 P.

The Leica DM2700 P purchased by the Geological survey of Zhejiang Province in this issue uses five objective lenses on the turntable of the five position adjustable central objective lens to obtain accurate sample information, obtain a large overview map in the 22mm field of view, and obtain better contrast with CU-3D illumination observed by incident light.