Hygrometer watches are timepieces equipped with a hygrometer, a device used for measuring humidity levels in the air. These watches are designed for people who need to monitor the humidity levels around them, such as hikers, campers, or people living in areas with high humidity. The hygrometer function can be found in analog or digital watches and can be used to provide information about the relative humidity level in the atmosphere. Some hygrometer watches also have additional features like a thermometer, altimeter, and barometer. These watches are popular among outdoor enthusiasts who need to track weather conditions and humidity levels for safety and comfort.