A hollow, wooden sound box, 105 X 11 X 6cm, with a 100cm scale graduated in mm on top. Two metal wires fixed along the scale are attached to two hooks at end, and to wrest-pin knobs at the other end of the sanometer. Pulley attached to box for hanging weight. With two long and two short bridges for adjusting length of vibrating strings. Recommended weight set no. 1960Cc; consisting of 9 weights and 1 hanger, total 5kg.