Precise Tuning Myth? Options

[Canis]

I've heard this from some people, while other people never have heard of such a thing, but here goes:

If I tune my guitar the way I'm used to (5th frets and such). Then I start from the low E string and gently hold my finger over the 12'th fret without touching the neck (the actual smal fret of wood, not the neckboard), ring it, release my finger and then play the same way with the 7'th fret on the A string. I've heard that if I listen to the sound, I can hear small vibrations if they're not tuned precise, and can use this technique to fine tune until I hear only a clean non-vibrating sound.
It makes sense since sounds are vibrations, and diffrent hertz create different tones.

I was basicly just wondering if any of the instructors or students have heard of this method, or if I've been ignorant for so long?


(The B string is tuned by holding down the 8'th fret all the to the neck the way you usually play, by the way)

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