Comprising a 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 wood.