Model PMA2170 Digital Relative Humidity, Dew Point, and Ambient Temperature Probe

Solar Light’s Model PMA2170 Digital Probe is an accurate professional-grade instrument for measuring relative humidity, dew point, and ambient temperature. A memory chip is embedded into the probe to store its signal processing, dew point calculator, and unit conversion program.

The relative humidity is the ratio of the actual vapor pressure to the saturation vapor pressure at a given air temperature, expressed in percent. Relative humidity displays an inverse relationship with absolute temperature when the vapor pressure is held constant. Dew point is the temperature the air would have if it were cooled (at constant pressure and water vapor content) until saturation (or condensation) occurred.