Features 1、Made of stainless steel, rustproof and strong. Suitable for most guitars, especially electric guitars. 2、The straight grooves design is easy to use and can be made straight no matter how many microholes are covered. 3、Dual scale design, suitable for most guitars, string length 24.75 inches and 25.5 inches. 4、Designed to check the flatness of the neck and the fingerboard without having to move the strings. 5、Practical tool for guitarist, which will help you get better performance. 6、Best hardness and thickness, specially designed for stringed instrument users. Can also be used for machine settings. 7、Precise manufacturing and calibration. Millimeter and inch dual scale, easy to use. Specification Condition: 100% Brand New Item Type: Guitar Ruler Material: Metal + stainless steel + plastic Applicable Instrument: Guitar, bass Package List 1 x Guitar Neck Straight Edge Ruler 1 x String Action Ruler 1 x Guitar Fret Rocker