Tuning Fork A 440


This small tuning fork produces a pure A 440 Hz tone when you strike it — let’s say against your knee — and then set it on the top of the cello’s bridge.  The sound naturally dissipates.  It is the most reliable for pitch and requires no battery.  Weight 14.6 g, diameter 3.6 mm, length 116mm  (4.25″)  Plastic case included.