Martin 18TOOL27 String Action Gauge

From the leaders in world class acoustic tone comes a must-have tool for maintaining proper setup. For use on all stringed instruments.

Setup Like the Pros
Standard & Metric Measurements
All Stringed Instruments
Suggested 12th fret action (can go lower if no buzzing is present).

Bass Side Treble Side

ACOUSTIC 3/32" (2.4mm) 2/32" (1.6mm)
BASS/NYLON 4/32" (3.2mm) 3/32" (2.4mm)
CLASSICAL 5/32" (4.0mm) 4/32" (3.2mm)
UKULELE 5/64" (2.0mm) 5/64" (2.0mm)