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Easy To Use Understring Radius Gauges For Guitar

  • Oct 20, 2025
  • 1 min read

Updated: Feb 3


FOR EVALUATION OF FRETBOARD RADIUS


Checking fretboard with an understring radius gauge

A handy guitar tool for determining the fretboard radius for regular and compound radius boards on 6-string guitars. The design allows for easier gauging of the fretboard by inserting from the bass strings side. The illustration above shows a vintage MIJ Strat which unexpectedly has a 15" radius!.


The nominal length of the understring gauges is 65mm.

The gauge should be inserted alongside a fret keeping perpendicular to the neck ensuring accurate measurement. The top radius of each gauge stem is identical to the bottom but rotated to create a widening arc along the length.


The gauges can be used as an aid for adjusting the string radius across the guitar - (where saddle adjustment permits) - and for setting pick up pole heights to the string radius.


CONVENIENT GAUGE SELECTION BY FLIPPING ROUND

The gauges are retained on a pin which provides for quick selection and progression through the radius sizes by flipping around until the correct gauge size is found.

10 individual sizes are included:- 7.25", 9.5", 10", 12", 14", 15", 16", 17", 18", 20".


Understring radius gauge set

 
 

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All tools are made to order using stock materials and components. This ensures highest quality of each component and their assemblies, guaranteeing that products are new and not stored for long period

 
 
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