Martin 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). Instrument  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)