Understring Radius Gauge and Guitar String Action Ruler Measuring Luthier Tool for Guitar Bass String Instruments Setup Repair Tool

Feature: Widely applicable: Guitar luthier set is suitable for measure string instruments such as electric guitar, electric bass, acoustic guitar, electric box guitar and so on. Simple and quick: Simply slide the string action ruler across the frets and read the measurement under the string with conversion chart of string action at 12th fret printed on one side, faster than use any other ruler, and stay parallel to the fingerboard that is much easier than trying to hold a ruler perpendicular to a rounded fret. Specification: Size: Understring radius gauge: 7.25 inch, 9.5 inch, 10 inch, 12 inch, 14 inch, 15 inch, 16 inch, 17 inch and 20 inch String action ruler gauge: 8.9 x 5.1 cm/ 3.5 x 2 inch Material: stainless steel Color: as shown in the picture Package include: 9 x Understring radius gauges 1 x String action ruler