.* Double-sided action gauge that can be used to measure saddle height,String height, saddle groove and groove height of fret and nut * Small size and lightweight guitar string action gauge measuring ruler, easy to carry and measure strings accurately * Chord action gauge ruler for double-sided measurement, with conversion tables for fractions, decimal, measurements and other units on the back, easy to use.* This guitar string measuring ruler can make the measurement faster and more accurate, saving time and tools* Guitar string measuring ruler made of high-quality plastic, strong and wear-resistant, durabl. Specifications:Size: Approx. 8.5x5.4cm/3.3x2.1 inch Weight: Approx. 10g Material: PlasticColor: As shown in the picturePackage Included:1 x Guitar String Operation Meter