Abstract: A dynamometer link comprises a first transmission member adapted to slide axially relative to a second transmission member with spring means disposed between the first and second transmission members. Relative displacement of the two members is amplified by a lever pivotally mounted on one of the two members and on which the other member operates. The lever comprises at least a radial arm articulated to one of the members and comprising at a distance from the articulation a two-way axial coupling to the other member and an axial arm having a free end on respective sides of which are disposed two detector members. The link is able to determine the direction of the force transmitted by the link.