A fluid measuring device comprising a capillary device and a non-linear response device wherein - the capillary device comprising a flow channel for determining the volume flow through the channel and two sidelets (5a, 5b) each comprising a pressure sensor arranged at a distal end of the sidelet, the sidelets (5a, 5b) being arranged in the capillary device to determine the pressure drop over at least a part of flow channel, the geometry of the flow channel of the capillary device being adapted to provide a flow response by the linear effects in a fluid, with the least response from the non-linear effects in the fluid, - the non-linear response device comprising a flow channel directly connected to the flow channel of the capillary device, the flow channel of the non-linear response device being a curved channel and comprising sidelets each comprising a pressure sensor arranged at distal end of the sidelet, the sidelets being arranged to determine a pressure drop over at least a part of the flow channel, the curved channel comprising o two opposite curved wall sections (8a, 8b) extending asymmetrically to each other at least through out a part of the flow channel, wherein ▪ one of the opposing curved wall sections defines a bump in the flow channel, so as to provide a fluid deflection into a flow pattern with curved stream lines from an inlet and to an outlet of the flow channel with increased shear in flow regions at the bump o an opening of one of the sidelets arranged immediately downstream of maximum height of the bump. - the capillary device comprising a flow channel for determining the volume flow through the channel and two sidelets (5a, 5b) each comprising a pressure sensor arranged at a distal end of the sidelet, the sidelets (5a, 5b) being arranged in the capillary device to determine the pressure drop over at least a part of flow channel, the geometry of the flow channel of the capillary device being adapted to provide a flow response by the linear effects in a fluid, with the least response from the non-linear effects in the fluid, - the non-linear response device comprising a flow channel directly connected to the flow channel of the capillary device, the flow channel of the non-linear response device being a curved channel and comprising sidelets each comprising a pressure sensor arranged at distal end of the sidelet, the sidelets being arranged to determine a pressure drop over at least a part of the flow channel, the curved channel comprising o two opposite curved wall sections (8a, 8b) extending asymmetrically to each other at least through out a part of the flow channel, wherein ▪ one of the opposing curved wall sections defines a bump in the flow channel, so as to provide a fluid deflection into a flow pattern with curved stream lines from an inlet and to an outlet of the flow channel with increased shear in flow regions at the bump o an opening of one of the sidelets arranged immediately downstream of maximum height of the bump. o two opposite curved wall sections (8a, 8b) extending asymmetrically to each other at least through out a part of the flow channel, wherein ▪ one of the opposing curved wall sections defines a bump in the flow channel, so as to provide a fluid deflection into a flow pattern with curved stream lines from an inlet and to an outlet of the flow channel with increased shear in flow regions at the bump ▪ one of the opposing curved wall sections defines a bump in the flow channel, o an opening of one of the sidelets arranged immediately downstream of maximum height of the bump.