Pro Tip – Measure Correctly: Always measure action at the 12th fret from the top of the fret to the bottom of the string. Use a feeler gauge or a precision ruler for accurate readings. Capo the 1st ...
12th Fret Rule: The 12th fret is always exactly halfway between the nut and the saddle — equal to half the scale length. This is the foundation of all fret position calculations. The vibrating string ...