You get the harmonic by just touching the string straight above 5th and 7th fret once the harmonic is made you may lift the finger and the tone will continue to sound
Harmonic from 7th fret (octav + fifth)
Harmonic from 12th fret (octav)
Harmonic from 5th fret two octaves above
Hit the string rather close to the end of the string
Click to hear the strings
The harmonic tuning is more accurate than the fret tuning, because you use the same string as reference for the whole guitar, and because you avoid the inaccuracies
When you slightly touch the string at certain points without pressing it down, you allow the string to form only its harmonics (see the animated pictures below) the sound is a litle like a flute, and it is called flagolet, after a French flute.
We are here using the 3rd and 4th harmonic which comes when touching the string slightly (without pressing down) exactly above the 5th and 7th fret.
You may use octave flagolettes as well for tuning. You get the octave flagolets above the 12th fret. (The method using octave flagolets is not described here)
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