StewMac String Action Gauge, Imperial – The Original Swiss Army Ruler for Guitar Setup
Designed and developed by StewMac, the String Action Gauge is the original precision tool for guitar setups. This pocket-sized stainless steel ruler is like a "Swiss Army Ruler" for guitar adjustments, providing fast, accurate measurements that make professional setups easier than ever. Trusted by luthiers and guitar techs worldwide, this is the same high-quality gauge used in top repair shops.
Accurate & Easy-to-Read Measurements:
String Height: Quickly determine the exact action at any fret.
Bridge Saddle & Slot Depth: Ensure precise saddle adjustments for optimal tone and intonation.
Nut Height: Dial in the perfect nut slot depth for smooth playability.
Fret Slot Depth: Ideal for measuring slots on unbound fingerboards.
Pickup Polepiece Height: Set your pickups at the right distance for balanced output.
Why This Gauge is a Must-Have for Luthiers & DIY Players:
StewMac Original Design: Developed in-house by renowned luthiers Dan Erlewine and Don MacRostie—often imitated, but never duplicated.
Progressive String Height Scale: Simply slide it across the frets and read the measurement under the string—faster and easier than a standard ruler.
Durable Stainless Steel: Precision-etched markings ensure long-lasting accuracy.
Pocket-Sized Convenience: Compact and easy to carry for setups anywhere.
Inch & Metric Versions: Available with measurements from .010" to .140" (inch model) or 0.25mm to 3.50mm (metric version).
Bonus Conversion Chart: The back of the gauge features a fractional/decimal/metric conversion chart for quick reference.
Pro Tip: Use this gauge for setting router depth—it sits securely on the router base for precise adjustments.
Whether you're setting up a new guitar or fine-tuning an old favorite, the StewMac String Action Gauge provides the accuracy and ease you need to achieve perfect playability.
Built to Last a Lifetime – All StewMac tools are backed by our Lifetime Promise.