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 air cools to this temperature, water vapor condenses into liquid, forming dew. This measurement is crucial in various fields, including meteorology, HVAC systems, and industrial processes, as it helps assess humidity levels and predict condensation. 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 optimal conditions in environments like greenhouses and data centers, where humidity control is essential.