The Duct Probe (DPB) interfaces to the ADR500 Router for discrete sensing of temperature, and for drawing air samples back to the SST Series Sensor Suite through the patented MicroDuct® communications path. Depending on the configuration of the Sensor Suite, many additional environmental parameters can be monitored “virtually” such as carbon dioxide (CO2), carbon monoxide (CO), dewpoint temperature, relative humidity (RH); small particles, and total volatile organic compounds (TVOCs). The probes can be mounted directly on a duct, or in outdoor environments.