EISCO Resonance Box with Tuning Fork and Hammer - Indicates C, E, G and C frequencies

Resonance box tuning fork. The steel fork is mounted on a solid wood resonance box. With hammer For demonstration of basic major chord formation. Consisting of four steel forks mounted on a common box, frequencies C (256), E (320), G (384) and C (512). Box base measures 11" long, 4" wide, and 2.5" high. Equipped with a rubber stopper at the bottom to prevent the equipment from moving or slipping.