A dew point meter is an instrument used to measure the dew point temperature, which indicates the temperature at which air becomes saturated with moisture. When the air cools to this temperature, water vapor condenses into liquid water, forming dew. This measurement is crucial in various fields, including meteorology, HVAC, and agriculture, as it helps assess humidity levels and predict weather conditions. Dew point meters can be either portable or fixed devices, utilizing different technologies such as capacitive sensors or chilled mirror techniques. Accurate dew point measurements assist in maintaining comfort in indoor environments and optimizing processes in industrial applications.