A scale measures the weight of an implement (1). A towing unit (19) of the implement is connected with a hitch (18) of a tractor (610). An axle weighing cell (46B) on board of the implement (1) measures the load onto an implement axle (48). A load weighing cell (46A) measures the vertical load applied onto the hitch (18). An evaluating unit (36) processes signals from both sensors (46A, 46B).