© 2019 by GMC Luthier Tools

Guitar Neck Notched Straight Edge 24"- 27" (610mm-685mm). ***Over 20 popular guitar scales using 1 tool!*** -  including Gibson, Fender, PRS & Gretch. A dual feature is the precision straight edge (400mm long), providing extra value & use.


The tool accurately checks the neck straightness & fretboard flatness independent of the frets. A feature of our notched straight edge is the removeable rest. The rest provides additional support for freestanding use. The height of the rest is adjustable allowing it to be used with or without strings fitted to the instrument. If using the tool with the strings fitted, the rest can sit on top of the strings for convenience or underneath the strings for extra stability. 

All fretboard scales from 24” to 27” (610mm-685mm) can be accommodated. This includes the following popular guitar scales: 24", 24.5", 24.5625", 24.625", 24.75", 630mm, 24.84", 24.9", 25.0", 635mm, 640mm, 25.34", 25.4", 645mm, 25.5", 650mm, 660mm, 26", 26.25", 26.5", 27".



The tool has 18 notches and its positioning on the neck will vary dependent on the guitar scale.

The universal tool works by only checking the length of the fretboard that is capable of being deflected and therefore the very highest frets are omitted (since these are well beyond the heel/neck join and won't be affected by truss rod adjustment or string tension).

A fretboard position reference is provided on the tool. The double-dots are positioned at the 12th fret for 24.5"-25.5" range. For shorter scales the dots are placed at the11th fret and longer scales use the 13th fret.


  • Multiple guitar scales accommodated.

  • Freestanding use - the rest keeps the tool stable during adjustments and checking.

  • Precision straight edge on one side - useful for other tasks.


GUITAR NOTCHED STRAIGHT EDGE - With Precision Straight Edge