Abstract: A flowmeter having an elongate probe (2) is insertable into a stream of fluid flowing within a pipe (4) to extend across the stream. The probe (2) includes an internal chamber (10) to extend across the stream, an upstream facing surface (12) against which the said flowing fluid can impinge, and a plurality of impact ports (14) extending through said upstream facing surface to the internal chamber (10). These impact ports (14) are spaced along said upstream facing surface (12) to sense the impact pressure of the fluid at different transverse points across the pipe (4). The impact ports (14) are dimensioned to restrict flow within the chamber (10) so that the pressure within the chamber (10) represents the average impact pressure across the flow profile.