Transmitters of the EE21 series have been developed for high-precision measurement of relative humidity and temperature. EE21 transmitters are available for wall and duct mounting with or without the very useful snap inmounting kit, which allows a quick and easy exchange of the transmitter. Outputs can be selected between voltage and current. An optional radiation shield providing a forced ventilation is recommended for use in outdoor applications. Special protection coating for the sensing element (code - HC) permits the permanent use in very polluted environments. High humidity calibration is recommended for applications in high lasting humidities > 90% RH (Code - CA01).