Fluid flow measuring device for measuring a fluid flow, comprising a rotatable, magnetic element, wherein the rotatable, magnetic element is positioned in the fluid flow, wherein the rotation of the rotatable, magnetic element depends from the fluid flow, wherein the rotation of the rotatable, magnetic element generates a magnetic field; further comprising at least one sensing coil pair having a first sensing coil and a second sensing coil, wherein the respective sensing coils of each sensing coil pair are arranged in such a way that the magnetic field generated by the fluid flow dependent rotation of the rotatable element has a first polarity and a first phase in the region of the respective first sensing coil and a second polarity and a second phase in the region of the respective second sensing coil, wherein at least said polarities differ from each other.