Tuning Fork 21 Hz with Plotter Pen

Description Tuning fork that allows for plotting oscillations on a sheet of paper. The oscillation is triggered by pushing the prongs of the fork together. The oscillation of the tuning fork is highly visible both with the naked eye or with the aid of a stroboscope. Includes a plotter pen with holder and a counterweight. Natural frequency: 21 Hz Length: 245 mm Total weight: approx. 170 g