Dew point reading is obtained with which thermometer?

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Dew point is found by assessing the moisture content of the air through a psychrometric method that uses two temperature readings: the ambient air temperature and the cooled temperature from evaporation. The wet-bulb thermometer has a wick kept moist; as air passes over it, evaporation cools the bulb, and the amount of cooling depends on how much water vapor is in the air. By comparing the wet-bulb reading with the dry-bulb (ambient) temperature, you can determine humidity and then infer the dew point from a chart or calculation. The dry-bulb or other thermometers only give temperature, not the moisture content necessary to read dew point directly, which is why the wet-bulb is the instrument used in this context.