String action is the distance of the string to the fretboard (neck).
Action, the height of the strings above the frets, measured at the 1st and 12th frets. Action at the 1st fret is primarily affected by the depth of the slots in the nut, while action at the 12th is affected equally by the nut and the saddle.
Measure string action (the height of the string above the fret) at any point by placing the gauge behind the string. The string height markings are at increments of .010" (ten thousandths of an inch). When the bottom of a mark aligns with the bottom of the string, that measurement is the string height at that point.
The markings themselves are .005" thick, so referring to the top of a mark instead of the bottom adds .005" to the measurement. In this way the progressive string height scale measures in .005" increments.
Frank Ford is a world renowned luither - repairman and has some of the best information available on-line.
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[ UL0 ] STRING_ACTION.PHP | Updated: Sunday, 09th June, 2013 @ 10:02pm