Make any guitar play better. We're often asked to recommend "must-have" tools for setting up guitars. So we've made it easy: the Basic Setup Kit features our most popular setup tools. These are the same super-accurate, high quality steel setup tools that professional repair shops depend on. Includes String Action Gauge (inches): The fastest way to measure the height of strings, nuts, saddles and pickup polepieces. Designed for stringed instrument work, it's much faster to use than any ruler. 18" Precision Straightedge: Machined for fanatic accuracy (to ±.0015" per foot)! Use it to check neck relief and evaluate truss rod adjustments. Understring Radius Gauges: A big help for matching bridge saddle heights to the fretboard curvature, for easier playability. Accurately laser-cut from stainless steel, the set includes 9 different fretboard radii. Free Instructions: Erick Coleman walks you through basic setup instructions to have your guitar playing great in no time.