DP4090 precision dew point hygrometer based on the principle of optical chilled mirror, it is a temperature and humidity measurement instrument. This principle is distinguished from indirect measurement of humidity through changes in capacitance and resistance, it directly measures according to the definition of humidity/dew point. 

Condensation mirror of DP4090 precision dew point hygrometer is processed by a special semiconductor, makes it have corrosion resistance for certain degree, also have high and low temperature resistance. It uses precision platinum resistance to measure dew point and temperature. It can adapt to most applications and ensure measurement accuracy. And can even be used in harsh environment. It adopts a 4-inch colorful capacitive touch screen display, which is simple, convenient to operate. Curve and multiple parameter conversion can meet various requirements.