Transmitters is a category of industrial devices rather than a specific brand, commonly used in process control and automation. These devices are produced by various manufacturers globally, including companies like Emerson (USA), Siemens (Germany), and Yokogawa (Japan). Transmitters serve industries such as oil and gas, chemical, pharmaceutical, and water treatment, providing critical measurements like pressure, temperature, flow, and level. Key products include pressure transmitters, temperature transmitters, and differential pressure transmitters, which convert physical parameters into standardized signals for monitoring and control systems.