Features: Accurately measure string spacing to ensure optimal playing experience, improve guitar pitch and comfort. Consist of stainless steel component, durability and rusts proof. The scale is clear and easy to read, suitable for use on various musical instruments. Suitable for guitarists, instrument repairers, and music enthusiasts to help improve their playing skills. Suitable for daily practices, instrument maintenance, and quick tuning before professional performances. Specifications: Dimension:85mm/3.34in Component:Stainless Steel Package Includes: 1pc Guitar String Action Gauge Ruler note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.