String Action Ruler Gauge Guitar Repairing Tool for Luthier Fit for Guitar Ukulele Bass Banjo Mandolin

This high-precision string action ruler gauge is an essential tool for luthiers, guitar technicians, and DIY musicians who need accurate measurements when setting up or repairing stringed instruments. Designed with durable stainless steel construction, this versatile measuring tool ensures reliable results every time. Perfect for adjusting string height, checking fretboard level, and maintaining optimal playability across guitars, ukuleles, basses, banjos, and mandolins. Its compact size and easy-to-read scale make it ideal for both professional workshops and home use. Whether you're fine-tuning a vintage instrument or assembling a new build, this gauge delivers the precision required for flawless setup.