Guitar String Action Ruler Gauge Tool - Guitar Luthier Accurate String Measurement - for Electric Bass and Acoustic Guitar by Creanoso ACCURATE MEASUREMENT for string instruments such as guitar, bass, mandolin, banjo, etc PORTABLE Pocket Size Stainless Steel Ruler, Markings are etched USEFUL SCALE for checking or setting string height, for bridge saddle height, saddle slot depth, fret slot depth and for nuts saddles and pickup polepieces height BONUS: 1 pc of Creanoso Guitar Pick BEST GIFT for guitarist and Musicians. Great Stocking Stuffer for Birthday, Christmas, New Year, Father's day, Thanksgiving, and Holidays!