Martin Guitars, String Action Gauge phase-90 HF Amplifier Power: 35W

HF Amplifier Power: 35W

It includes a universal clip-on mount

and ultra-low-noise performance

It's compatible with F31

Martin Guitars, String Action Gauge phase-90 HF Amplifier Power: 35WFrom 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)