Keep your guitar performing its best with this Guitar String Action Gauge Ruler—the essential tool for precise setups and effortless playability. Whether you're adjusting string height, pickup distance, or neck relief, this luthier-grade stainless steel ruler delivers reliable, accurate measurements every time. The dual-scale design features laser-etched inch and metric markings that won't wear off, while the rounded edges protect your guitar's finish. Compatible with electric, acoustic, and bass guitars, this compact tool slips easily into your gig bag or case. Includes a protective PU leather sleeve for safe storage and long-lasting durability. Perfect for professional technicians, DIY players, and guitar enthusiasts who want consistent tone and feel.