This device visualizes the air flow without contaminating the clean room. The clean air filtered by the HEPA filter will release mist of pure water, so it is a clean mist. It is possible to confirm the laminar flow and the turbulent state inside the clean room and clean equipment, and to check the vortices and stagnation in the vicinity of the equipment. It is lightweight, so it is easy to carry around. Although AC power is standard, there are also battery-powered models (options).