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 Design: Pocket-size gauge stays parallel to the fingerboard for easier readings than a standard ruler and includes a fractional decimal metric conversion chart on the back
• Pocket-Sized Convenience: Compact and easy to carry for setups anywhere.
• Inch & Metric Versions: Available with measurements from .010" to .140" (Imperial) or 0.25mm to 3.50mm (Metric)
• Conversion Chart: The back of the gauge features a fractional/decimal/metric conversion chart for quick reference