The Martin Guitars String Height Action Gauge is a must-have tool for players and luthiers who demand precision and consistency in their setups. Designed by one of the most trusted names in acoustic instruments, this handy gauge helps you dial in ideal string action for enhanced comfort, tone, and performance.

With both standard and metric units, the gauge is compatible with virtually any stringed instrument — including acoustic and electric guitars, basses, mandolins, and ukuleles. Whether you're setting up for the first time or fine-tuning a professional rig, this durable gauge provides the clarity and accuracy needed to achieve perfect string height at the 12th fret and beyond.

• Dual-unit gauge for measuring in standard and metric

• Suitable for guitars, basses, mandolins, ukuleles, and more

• Precision markings for quick reference and optimal setup

• Ideal for achieving clean, buzz-free low action

• Trusted by luthiers and guitar techs worldwide

Specs

• Measurement Units Standard and Metric

• Material Metal

• Application String height/action measurement

• Suitable For Guitars, basses, mandolins, ukuleles, and other fretted instruments

• Recommended Use 12th fret action adjustment