Tuning fork, 440 Hz, with resonance case

A 440 Hz tuning fork with a wooden resonance box that produces and amplifies its sound (making it clearly audible), for experiments on the resonance and interference of sound waves. The box has four soft buffers underneath and a top insert that holds the 440 Hz fork. Tuning fork approx. 32 x 11.5 x 172 mm; resonance box 175 x 97 x 54 mm; mass approx. 403 g.