Semiautomatic scales
In the late 1930s, Italiana Macchi began to manufacture "semiautomatic" and "single-pan semiautomatic" scales: the latter went down in history by the nickname "bilancia a scatti", meaning step balance scale, because the maximum capacity could be selected by means of a rotary knob.
Finally, the seller no longer needed the sample masses to match the weight of the goods: this improvement required more counter space and higher speed between weighing operations.