Quality material: these guitar gauge set is made of stainless steel with rounded off edge, rustproof and corrosion-resistant, won't scratch or hurt your hands, durable for long-term use String action gauge ruler: the pocket-sized gauge ruler is marked with metric and imperial scale respectively on 2 sides, can be applied to measure string height, bridge saddle height, saddle slot depth, pickup polepiece height, fret slot depth and nut height [Versatile & Widely Used] Our multi-tool set is designed to measure, polish, grind, and adjust all kinds of string instruments, ideal for both luthiers and beginners alike, ensuring you can get the job done right Whether you're measuring the height of frets and strings, pick-ups, level of fingerboard, width of pillow on the groove, deformation degree of the guitar neck and more, our tool set has you covered. From experienced musicians to novices, our simple and precise set allows anyone to play the right chords without stressing their fingers. Wide range of use: the feeler gauge set is suitable for measuring all kinds of electric guitar, electric bass, electric box guitar fretboard measured in radians to adjust the strings piano code Package: T-Type ruler 9-piece set x 1+PVC string height ruler x 1+32-piece string distance ruler x 1+radical ruler x 4 Colour:Silver Material:Stainless steel + plastic Package Contents: 1 set x Guitar Measuring Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.