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136.1 Hertz or 136.1 Hz is the standard frequency of the Om tuning fork.
136.1 Hz is the frequency used to tune the instruments for Indian temple music. It is called Sadja, or Sa, the base tone of the Sitar and Tambura. The Om Tone is said to stimulate the Anahata (heart chakra) and hence is widely believed to be good for meditation.
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