Leica EM ACE900 is a high-level sample preparation system. A single instrument has created many ideal conditions, creating a good protective environment for the vitrification freezing structure, preparing detailed image evaluation samples, avoiding the formation of false images, and achieving new breakthroughs in the simplicity and speed of high-level freezing coating technology. A device can perform functions such as sample freezing fracture, freezing etching, and electron beam coating, and has achieved a very high level of quality. It is an important tool for processing EM samples.