This is a DENSsolutions Stream Flow Controller, a specialized piece of laboratory equipment designed for precise control of gas or liquid flow in scientific experiments. The unit consists of a white main control box with multiple tubing connections and an Ethernet port, mounted on an adjustable gray stand with wheels for mobility. Below the main unit, there is a black control module also branded ‘Stream’ and a white shelf holding various cables and a small electronic device. A pressure gauge and a green gas cylinder holder are visible on the stand. The overall condition appears used but functional, with some visible wiring and tubing. This equipment, likely used for several years, is crucial for applications requiring accurate fluid dynamics, such as in situ electron microscopy experiments.