
The original design Rydel Seiffer 64 Hz graduated tuning fork.
Hartmann Tuning Forks.
The original design Rydel Seiffer 64/128 Hz graduated tuning fork.
Rydel Seiffer 64/128 Hz graduated tuning fork with chrome finish.
Rydel Seiffer, Gardiner Brown, aluminum, steel, for medicine, science ad healing arts. Custom size or frequency also possible. Please inquire.