Notched Straightedge

  • 66 Reviews
  • Write a review

Read the fretboard instead of the frets. Developed in our shop, the notched straightedge has become a standard for evaluating fretboards.

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For guitars

Item # 3814
In stock, ready to ship!



For basses

Item # 3813
In stock, ready to ship!



For short scale basses and baritone guitars

Item # 3812
In stock, ready to ship!


Total: $0.00
Quantity: 20


Notched straightedge for guitar or bass

Dan Erlewine demos the notched straightedge from StewMac. This tool lets you check a guitar or bass neck for straightness, with or without the frets in place.

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Read the fretboard instead of the frets. Developed in our shop, the notched straightedge has become a standard for evaluating fretboards.

The notches fit right over the frets so you can check the straightness of the fretboard itself, without the interference of worn or badly-seated frets.

Made of machined stainless steel, satin-finished for easy marking with a pencil (cleans off easily).

#3814 For guitars
One edge is notched for Gibson "long scale", plus Fender and Martin fretboards. The other edge fits Gibson's 24-3/4" scale, plus 25" Paul Reed Smith and Dobro® Scale.

Length 16-1/2" (420mm)
Width 1-1/2" (38mm)
Thickness .130" (3.25mm)

#3813 For basses
One edge is for Fender 34" scale; the other edge for 35" scale.
Length 22-5/8" (575mm)
Width 1-1/2" (38mm)
Thickness .130" (3.25mm)

#3812 For short scale basses and baritone guitars
One edge fits Fender Bajo Sexto 30.2" scale, Gibson EB 30.5" scale, plus Fender 30" short-scale bass and Danelectro 30" baritone scale. The other edge fits Fender's Baritone Custom Jaguar 28.5" scale, Eastwood's 28" scale and custom baritone scales falling between 28" and 28.5".
Length 19" (482.6mm)
Width 1-1/2" (38mm)
Thickness .130" (3.25mm)

Ratings & Reviews

Notched Straightedge

  • Based on 66 Reviews
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Good For Truss Rod Adjustments

By Erik H. from USA
(Customer's Reviews) Wednesday, June 04, 2014

The straightedge works well for getting the relief of a neck correct without worrying about uneven frets due to the notches in the straightedge. The guitar one has two sides for different guitar fret scales. The only thing to watch out for is that you don't scratch the fingerboard with the tool moving around.


By mess from Indianapolis IN
(Customer's Reviews) Sunday, May 25, 2014

I don't know how I ever did setups, or fret jobs without this. I was always knew that the fretboard straightness was a problem on several guitars in the past, but this takes the guess work out of the equation and lets you exactly where the problem is.


By Jose Maria from Valladolid, Spain
(Customer's Reviews) Tuesday, April 29, 2014

Perfect. You can check any guitar without going crazy.

Great For Amateur Techs!

By John Ryan from Newtonville, MA
(Customer's Reviews) Thursday, March 27, 2014

I'm not a professional guitar tech; I just enjoy mantaining my own guitars. THIS has very quickly become my most important tool. Using a traditional straightedge, with the limited surface area of the frets, I'm unsure whether I'm seeing a truly straight neck or if I'm being thrown by irregular frets. With the Notched Straightedge, I'm 100% certain every time because the tool is resting right on the fingerboard, with more surface to read. I can then use a regular straightedge along the frets to find any highs or lows. My only issue is that the tool's edges are relatively sharp, so be careful handling it or you may scrape some finish off. Thank you StewMac for this great product!

Amazing tool

By Paul Richard from Oshawa,Canada
(Customer's Reviews) Friday, February 28, 2014

This is easily the best tool in my tool box.I instantly know,no guess work, how much relief I have without having to hold onto it as it is free standing. I am really happy that it is able to read both long & short scale in one tool. It was expensive but absolutely worth every penny. I love it!

Pro Tool

By RAC from New York, NY
(Customer's Reviews) Wednesday, February 12, 2014

This is a beefy piece of steel -- stainless -- not the aluminum junk online some guy cranks out on his basement CNC machine. If you want to set neck relief accurately, you have to measure from the fretboard, not the tops of the frets. This is the right tool for the job.

Just arrived and already in use....

By ElectricLarryLand from New Braunfels, Tx
(Customer's Reviews) Saturday, January 11, 2014

The straight edge just arrived in perfect time for me to use it to slay a charging Rhino. I love the weight and stability. I didn't expect that. So much better than the straight edge I've been using all this time.

Most essential setup tool

By Timm from Brighton, East Sussex, UK
(Customer's Reviews) Saturday, January 11, 2014

Makes the job very easy. Perfectly adjust your neck. Very robust tool for continued accuracy.

worth buying

By IronHorse from Orangeburg, NY
(Customer's Reviews) Tuesday, December 17, 2013

This is another tool worth having in your stable of straight-edges. It's totally worth the money and can be very helpful in certain situations. The only problem is that is starts at the 2nd fret, not the 1st. Problems at the 1st fret can be a drag. Maybe Stew-Mac can change the ones made in the future and this tool would be most amazing then! I'd buy another one if they did that.

Great tool

By Sylvain from Matane Qc
(Customer's Reviews) Sunday, November 10, 2013

Very fast for tuning truss rod with strings!

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Shown on page 16 of our latest catalog.