It is mainly used for internal visual inspection of closed containers and complex pipelines such as reaction tanks, mixing equipment, pipeline systems, and filling lines. It can quickly check for residual, corrosive, worn, and cleaning dead corners on the inner wall without disassembly, effectively ensuring the effectiveness of cleaning verification and compliance with production processes, significantly reducing pollution risks and equipment disassembly costs. It is an important testing tool to ensure drug quality and compliance with GMP standards.