Which device reads humidity indirectly via evaporative cooling and is used in heat stress assessment?

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The device uses evaporative cooling to gauge humidity indirectly, which is essential in assessing heat stress. A wet-bulb thermometer has a moistened wick around its sensor. As air flows over the wet wick, water evaporates and cools the sensing element. How much cooling occurs depends on how dry or humid the air is: in dry air, evaporation happens quickly and the wet-bulb reading drops; in humid air, evaporation slows and the reading stays higher. This cooling effect provides an indirect measure of humidity and is used alongside other readings to evaluate heat stress, such as in the WBGT index. The other devices measure temperature directly and do not rely on evaporative cooling to infer humidity.