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Phi Ratio Tuning Fork Set! The 288hz & 468 hz Tuning Forks are middle D and A# frequencies in the Pythagorean Scale.

Pythagorean tuning is a system of musical tuning in which the frequency ratios of all intervals are based on the ratio 3:2. This ratio, also known as the "pure" perfect fifth, is chosen because it is one of the easiest to tune by ear and because of importance attributed to the integer 3.

Nikola Tesla once said "If you only knew the magnificence of the 3