HM40 Series Handheld Humidity and Temperature Meter is developed for humidity as well as temperature measurements in different spot-checking applications. It is designed for checking and calibration of fixed humidity instruments. It comes with RH measurement ranging from 0 to 100 %. It is developed from 3 probes to temperature measuring ranges between +180 and -70 °C. This device comes with multiprobe operation where dewpoint a well as CO2 probes can be connected. In addition to this, it easily displays different humidity parameters.