Comprising a teak wood resonance box 1140×125×100 mm length × width × height with meter scales one meter long subdivided in millimeters. One each brass and steel wires of S.W.G. 26 and 24 respectively, attached to a fixed bridge and tensioned by fine adjustment pegs: two moveable bridges, pulley and fixed screw to enable a third wire to be fixed for tensioning by weights.Wooden resonance box is made from superior quality teak wood and all metal parts are of brass.