The Cosmic OM Tuning Fork creates a vibration that resonates with the 'Cosmic Om.' . It is believed that "OM" is the mother of all languages. Repetition of "OM" enables us to maintain mental and emotional calmness, overcome obstacles and enable understanding. It is an everlasting, never-stopping tone.Our soul has this same frequency. Indians, in olden times, were given this tune in meditation naturally, as they opened themselves to the cosmos. These Tuning Forks give amazing results in meditation, reaching out to Universal Energies, journeying, in an energy-work session. Their effect is to relax, soothe, balance and sedate.

In the Chakra set, this is the Heart fork.The color resonates to is Blue-Green.

One of the fundamental mantras used in meditation is Om. The intention of 'om' is to cause you to be one with all life thereby opening yourself to unlimited growth. The mantra is not beneficial due to its literal translation but instead to its vibratory frequency.

This fork is based on the revolution of the planets around the Sun which causes the different seasons like spring, summer, autumn and winter. It vibrates to a frequency equal to an Earth Year which is 365 days and is in the 32nd octave.
Benefits:
It gives peace, calmness, tranquillity and serenity.
It promotes relaxation.
It opens up our heart chakra.
It helps us in meditation and connects us to Cosmos.
Pain relieving effect on our body
This tuning fork is based on :

C# 136.10 Hz