Most tuners are based on an A=440 international standard of measure. Here is an interesting story about frequencies in the universe and their potential effects on us.

“Tesla said it. Einstein Agreed. Science proved it. It is a known fact that everything—including our own bodies—is made up of energy vibrating at different frequencies. That being said, can sound frequencies affect us? They sure can. Frequencies affect frequencies; much like mixing ingredients with other ingredients affects the overall flavor of a meal. The way frequencies affect the physical world has been demonstrated through various experiments such as the science of Cymatics and water memory. – See more at: http://www.collective-evolution.com/2013/12/21/heres-why-you-should-convert-your-music-to-432hz/”

http://www.collective-evolution.com/2013/12/21/heres-why-you-should-convert-your-music-to-432hz/
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