A humidity sensor is not a specific brand but a type of device used to measure and monitor humidity levels in various environments. These sensors are produced by multiple companies worldwide, such as Honeywell (USA), Sensirion (Switzerland), and Omron (Japan). They serve industries like HVAC, agriculture, healthcare, and manufacturing, providing accurate humidity data for environmental control, process optimization, and equipment protection. Key products include capacitive, resistive, and thermal conductivity humidity sensors, often integrated into IoT and industrial automation systems.