... wide range of low air velocity measurements. CharacteridticQDF -6 Digital anemometer is a kind of portable instrument Compact design, ... small volume, stable performance, easy to carry ApplicationQDF -6 Digital anemometer is widely used in indoor heating, indoor ventilation, air ... :Error: ≤±3% error of full scale under working environmentError: ±5% error of full scale for probe deviation within ±15%l ...