A flow metering device for pulmonary function tests. The device has a sensing element extending in a longitudinal direction and defining an inner volume and an adapter unit. The sensing element is a measuring tube with open ends, and a pressure difference inducer is arranged in the measuring tube between the open ends. The pressure difference inducer is in contact with the measuring tube, partially occupies the inner cross section thereof, and is formed by spoke arms joined in pairs in a single point. The spoke arms in a pair close a given angle with one another, and pressure offtake grooves are formed in the surfaces of the spoke arms perpendicular to the longitudinal direction of the measuring tube. Such pressure offtake grooves enable a radial averaging of pressure. The adapter unit is provided with pneumatic low-pass filters formed as integral parts thereof.
