ThermoAir3O5 Multifunction Wind Measurer For the measurement of temperature and very low air flow from 0.01 ... 5 m/s with included omnidirectional sensor. ThermoAir3O5 is a high-accuracy multifunction anemometer or wind measurer for the measurement of temperature and very low air flow. Complete with automatic temperature compensation (ATC), the handheld ThermoAir3O5 is a must-have multipurpose measuring instrument, a combination anemometer / thermometer for use in industrial, laboratory, clean room and heating, ventilation and air conditioning (HVAC) applications. Humidity measurement is possible via an optional humidity sensor - not included, sold separately.