The HMD/W80 series transmitters measure relative humidity and temperature in various building automation applications providing excellent and reliable operation. The interchangeable sensor is easy to replace and requires no recalibration. In addition, the sensor is insensitive to dust, as well as most chemicals. The transmitters require no routine maintenance—a smart choice for HVAC and EMC applications. Available in wall and duct-mount models; both offer simple installation and low maintenance.