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The demonstration tuning fork whose oscillation is so slow that the note cannot be heard (around 5.4 Hz). On the other hand, it is easy to follow its movements with the eyes.
Made of nickel-plated steel.
Length 78 cm

Tuning fork set with 8 x different frequencies: 256, 288, 320, 341.3, 384, 426.6, 480, 512 Hz.
Each set can be stored in the included plastic box (325 x 265 mm).
The forks vary in length: 95 mm – 145 mm.