A device 100 for measuring a shear stress of a fluid comprises an inlet section 101 through which the fluid is guidable, wherein the inlet section is formed such that the fluid streams through it along a first streaming direction 102. A tube 103 is connected to the inlet section such that the fluid is streamable from the inlet through the tube, wherein the tube comprises a transition section 104 formed such that the fluid streaming through the tube is deflected from the first direction 102 to a second different streaming direction 105. The tube 103 is deformable by deflecting the fluid from the first streaming direction to the second streaming direction within the transition section 104. A deformation sensor 106 measures a deformation of the tube indicative of the shear stress of the fluid. Several transition sections and sensors may be included.