Guitar String Action Gauge Ruler Setup Guitar and Bass Luthier Tool

With scale for string height, for ridge saddle slot depth and for nuts saddles and pole pieces, guide for setting the action on any stringed instrument. It's faster to use than any ruler, and stays parallel to the fingerboard—much easier than trying to hold a ruler perpendicular to a rounded fret. The gauge features a progressive string height scale: simply slide it across the frets and read the measurement under the string. With conversion chart of string action at 12th fret up to Fender guitar standard printed on one side. Long lasting etched printing, the printing will not wear off from long use. Suitable for string instruments such as guitar, bass, mandolin, banjo, etc. Scale range for string height: 0.01-0.14inch / 0.25-3.50mm. Scale range for bridge saddle slot depth: 0-0.875inch / 0-20mm. Scale range for nuts saddles and polepieces: 0-0.48inch / 0-20mm.