Humidity sensors are not a specific brand but a category of devices used to measure 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, automotive, healthcare, agriculture, and industrial automation. Key products include capacitive, resistive, and thermal conductivity humidity sensors, often integrated into IoT and smart systems for environmental monitoring.