Description This versatile guitar string action ruler is designed for precise measurement and adjustment of string height and spacing. Crafted from durable stainless steel, it features clear markings for easy reading. Ideal for electric guitars, it ensures optimal playability and helps maintain your instrument's performance during setup or repair. Features -Color:Silver -Material:Metal, Plastic -Size:42.00X3.70X0.20cm/16.51X1.45X0.08in -Size:7.00X6.30X0.10cm/2.75X2.48X0.04in -Size:8.50X5.40X0.10cm/3.34X2.12X0.04in -Size:10.00X5.00X0.15cm/3.93X1.97X0.06in -Precision adjustment: ensure perfect playability and enhance your guitar's tone with precise string height adjustments -Multifunctional design: suitable for both electric and acoustic guitars, catering to various needs and preferences -Quick measurement: effortlessly measure string height and adjust the gap between strings and frets for an optimized playing experience -Essential repair tool: a musthave for guitar enthusiasts and professional technicians to accurately calibrate instrument conditions -Portable size: compact and easy to carry, ideal for use at home or on stage for quick adjustments anytimePackage list: 9 x Understring radius gauges 1 x Guitar luthiers tool 1 x Fret rocker 1 x String action ruler