The invention relates to a weigh sensor comprising a part (110/111/112) affixed to the housing and a load sensor (102) that is movably connected to the part affixed to the housing by means of a parallel guide consisting of a top arm (103) and a bottom arm (104). According to the invention, heating or cooling elements (120, 121) are provided, said elements locally modifying the temperature in the load sensor (102) and/or the part (110) affixed to the housing between the supporting points of the top and bottom arms relative to the rest of the weigh sensor. As a result of thermal dilation coefficients of the material of the weigh sensor, the vertical distance between the top and bottom arms is slightly modified with the purpose of adjusting corner load. This makes it possible to carry out fine adjustment of the corner load without having to perform any mechanical operations in the weigh sensor while only using electrical means.