The present document describes a flow measuring apparatus for measuring aflow through a section of an inhalation apparatus, and an inhalationsapparatusfor drug delivery by inhalation comprising the flow measuring apparatus. Theflowmeasuring apparatus comprises a set of Pitot tubes configured for traversingentirely the lumen of the section of an inhalation apparatus. The set of Pitottubescomprises a first and second Pitot tube which are respectively fluidlyconnectedto a differential pressure sensor, for measuring a difference between adynamicpressure and a static pressure within the flow measuring apparatus.
