The companion app for UEi's DTHA2 wireless adapter. Enable Bluetooth on your mobile device, launch the app, connect DTHA2 and measure: a) Airflow velocity (ft/min, mph, m/s, or km/h) b) Volumetric flow (CFM, m^3/h, or L/s) c) Temperature (F or C) d) Relative Humidity The app allows you to adjust for Round or Rectangular Ducting (in or cm) as well as take Averages over Time or Average via Point readings.