Flow meter for flow measurement of flowing fluids, wherein the fluids flow over a measurement path which is situated in a measurement tube and which, in at least one section, has a main channel (24, 26) and at least one secondary channel (25, 27, 27a, 28), and wherein an input coupling device (8, 9, 31) couples a measurement input signal into the fluid flowing through the main channel (24, 26) and a detection device (9, 8, 32) detects the measurement input signal and/or a measurement output signal which arises on account of the measurement input signal, wherein, for a predetermined fluid, it is the case that the fluid flows through the main channel (24, 26) and secondary channels (25, 27, 27a, 28) both with a first total flow quantity of the fluid per unit time and with a second total flow quantity of the fluid per unit time, which is greater than the first total flow quantity per unit time, wherein the ratio of the flow quantity per unit time through all the secondary channels to the flow quantity per unit time through the main channel (24, 26) is greater for the second total flow quantity per unit time than for the first total flow quantity per unit time, wherein provision is made of at least two secondary channels (25, 27, 28) which in each case have a smaller cross section than the main channel (24, 26), wherein a fluid-mechanical displacement of the fluid quantity is realized in such a manner that, as a result of the transition in the secondary channels (25, 27, 28) from laminar to turbulent flow when the total flow quantity per unit time is increased, the distribution of the total flow quantity per unit time is displaced from the main channel (24, 26) to the secondary channels (25, 27, 28). wherein the fluids flow over a measurement path which is situated in a measurement tube and which, in at least one section, has a main channel (24, 26) and at least one secondary channel (25, 27, 27a, 28), and wherein an input coupling device (8, 9, 31) couples a measurement input signal into the fluid flowing through the main channel (24, 26) and a detection device (9, 8, 32) detects the measurement input signal and/or a measurement output signal which arises on account of the measurement input signal, wherein, for a predetermined fluid, it is the case that the fluid flows through the main channel (24, 26) and secondary channels (25, 27, 27a, 28) both with a first total flow quantity of the fluid per unit time and with a second total flow quantity of the fluid per unit time, which is greater than the first total flow quantity per unit time, wherein the ratio of the flow quantity per unit time through all the secondary channels to the flow quantity per unit time through the main channel (24, 26) is greater for the second total flow quantity per unit time than for the first total flow quantity per unit time, wherein provision is made of at least two secondary channels (25, 27, 28) which in each case have a smaller cross section than the main channel (24, 26), wherein a fluid-mechanical displacement of the fluid quantity is realized in such a manner that, as a result of the transition in the secondary channels (25, 27, 28) from laminar to turbulent flow when the total flow quantity per unit time is increased, the distribution of the total flow quantity per unit time is displaced from the main channel (24, 26) to the secondary channels (25, 27, 28).