Abstract: This invention relates to a weight measuring balance especially adapted for the proportioning of a liquid product mixture from cumulative formulas expressed in weight.The balance comprises a pan borne by a centrally fixed stress gauge captor, mounted upon a fixed frame and which furnishes a signal representative of the load's weight, whatever may be the position of the load on the pan, to a measuring device carrying out the display of the weight thus detected on a first display device.The invention is especially applied to the formulations of paints used in automobile body shops from cumulative formulas expressed in weight.