The Otto Tuning Forks are used for relaxation and for sending vibrations into the bones. The Otto Tuners are available in 3 different frequencies. This Tuner is tuned to the frequency of 64hz. It vibrates at a low pitch due to its weighted prongs. You may start your explorations with the 128hz and then graduate to this frequency, before moving on to frequency of 32Hz. This fork is especially effective when placed on the sternum, vertebra and meridian points.Used primarily for relaxation and grounding, the Otto Tuners resonate with the deeper tones of the Earth.The Otto Tuner is the note of C in the diatonic scale.These frequencies project sound into the physical body, especially in the bones.The effect is to replenish the tone of tissues and to align them well. Great for sore muscles and relaxation of bones.C-64Hz - helps loosen sacral ligaments and stimulate and balance between the sympathetic and parasympathetic nervous systems.Useful in emotional trauma and grounding. All our Tuning Forks are made from special grade Aluminium alloy and frequency is guaranteed to tuned to an accuracy of +/- 0.25% which is very good for healing.