Uxsiya Machinist Tools, Sturdy Radius Gauge Uitar Radius Gauge Accurate Measurement Guitar String Altimeter for Guitar - ShopVlot

Radius instrument has 9 sizes: 7.25'' 9.5'' 10'' 12'' 14'' 15'' 16'' 17'' 20''. Use this to precisely adjust the guitar bridge saddle to the radius of the fretboard. Use the bottom radius of the meter to accurately measure the key radius of the instrument. Then use the matching upper radius of the gauge to determine the correct height adjustment for the saddle. These are the most popular key radii, which makes it easy to measure the radius above or below the strings.