a set of weighing scales comprising a moving part able to move vertically relative to a fixed part and serving to support the load against the action of an elastic balancing device . its guidance device comprises at least three sets of roller trains extending in radial planes passing through the guidance axis , whereby each roller is mounted loosely on one of the parts in such a way that there is a clearance between its tread and the other part . this guidance device cooperates with at least one anti - gyratory roller extending in a tangential plane and which mounted on loosely mounted on one of the parts and which is positoned with a clearance between the two vertical members of the other part . its indicating device is of the floating type .