UEi DAFM3B Handheld Digital Air Flow Meter is designed to measure humidity, air temperature, dew point, wet bulb, air velocity, and air volume. The UEi DAFM3B features a sensor built into the remote fan that is protected by a removable twist cap. This unit also has some special improvements over its older model, the DAFM3, such as an improved connection between the air vane and base, real-time air volume display, a timed average feature, and overall improved user interface.