I recommend purchasing from a reputable and high-quality distributer. All forks are not created equal. This is why I use Biosonics or Omnivos forks. 

Check out: https://biosonics.com/faqs/

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From Dr. John Beaulieu:

“I discovered the healing effect of musical intervals while sitting in a completely soundproof room, resembling a sensory deprivation chamber, for five hundred hours over a period of two years and listened to the sounds of my own body. Being a trained musician I became aware of the many sounds made by my own nervous system. One day I brought two tuning forks into the chamber and tapped them together. Immediately I observed that the sound of my nervous system realigned to the sound of the tuning forks. It was then that I realized that people can be tuned like musical instruments!”

 

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