With force sensors, the measuring element is deformed. This deformation is measured with a strain gage in the form of strain. The mechanical components of machines and apparatus also deform when forces act on them. This deformation can be measured with a strain sensor instead of with a strain gage. The force acting on the mechanical structure or on the component part can be determined on the basis of the measured strain. The relationship between strain and force is determined by the design of the mechanical component from which the sensor picks up the strain. The main influencing factors are the cross-sectional area and the E module of the component. Assembly is effected either by screwing, clamping or pressing. In this sense, a strain sensor is like an industrial strain gage which does not have to be elaborately glued in the production line or in the service department, but is quite simply mechanically mounted.