Abstract: A device for measuring flow rate of a gas in a pipe includes a flow guide for eliminating eddies from the gas flow at a distance upstream of a turbine wheel gas meter which at the side facing the flow guide is provided with a blunt, rounded nose part. The flow guide has at least one dividing wall which is concentric with the inside wall of the pipe and a number of uniformly distributed radial dividing walls extending on both sides of the circumferential dividing wall. The dividing walls define flow apertures which are of quadrangular form and are substantially equal throughout the flow guide. The flow apertures are arranged in a plurality of circumferential rows in the flow guide.