Description Features: Made from stainless steel, this guitar string height gauge is built to last and will withstand years of use. With scale to measure string height, bridge saddle height, saddle slot depth, pickup polepiece height, fret slot depth and nut height. The scale is clear and easy to read. Two units comparing groups are visible including inches and millimeter. Perfect accurate action measurements for string instruments such as guitar, bass, mandolin, banjos, etc pocket-size body, you can takes it anywhere. Say goodbye to your heavy caliper. Specifications: Material: Stainless Steel Size: Approx. 8.9x5.1cm/3.50x2.01inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x String Action Gauge Ruler