String Action Gauge Guitar Ruler for Electric Bass Acoustic Guitar Ukulele Mandolin Banjo With scale to measure string height, bridge saddle height, saddle slot depth, pickup polepiece height, fret slot depth and nut height, Fret Crown Height. With conversion chart of string action at 12th fret printed on one side. From inch fractions, to inch decimals, to metric in increments. Dimensions: 9.1 x 5.1 cm/3.6 x 2 in. Both sides of the ruler are used for different measurements. A Side (logo side, units: inches) Fret crown high measurement scales. String height measurement scales. Measurement scales for saddles, pickup pole pieces (pickup screws) and nuts. Bridge saddle slot and fret slot depth measurement scales . String, bridge saddles and nut string spacing measurement scales. B Side (units: millimeters) Same scales as A side but in millimeters. The string action setup measurement guide at the center displays the most common string action settings, depending on the type of guitar you work on. Note: For best results when you are using the string action ruler, make sure the guitar neck is properly set up. Specifications Material: Stainless Steel Color: As the pictures show you Application: electric guitar, bass and acoustic guitar Unit: mm/ in Scale for string height: 0.01-0.14in / 0.25-3.50mm Scale for bridge saddle slot depth: 0-0.875in / 0-20mm Scale for nuts saddles and polepieces: 0-0.75in / 0-20mm Fret Crown Height: .024-.056 in/0.61-1.24 mm Ruler size: 9.1 x 5.1 cm/3.6 x 2 in (length * width) Weight: 20g Package including 1 x String Action Ruler 1 x Handmade Genuine Leather Case