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Here's how ya do it: Tune up the string and then play it at the 12th fret.
If the note at the 12th fret is sharp the string is too short. Make the string longer by moving the saddle away from the neck. Tune up the string and try again.	If the note at the 12th fret is flat the string is too long. Make the string shorter by moving the saddle towards the neck. Tune up the string and try again.