Force measurement device for controlling the position of an implement for towing by an agricultural machine

A force measuring device for an implement for towing an agricultural machine comprising at least one connection arm between the implement and a flexure bar mounted on said agricultural machine, at least one lever connecting the arm to a control system, wherein said control system comprises an electrical circuit arranged to control the movement of the lever by means of a mechanical and/or hydraulic member, the electrical circuit comprising at least one resistive element fixed to a portion of the flexure bar, the resistive element being constructed of a material the resistance of which is proportional to the deformation which the element undergoes when in use.