Measures the distance between the guitar string and the neck to accurately determine string height at the fretboard. Constructed from strong, durable metal for long life and repeated use. The scale and numbers on the guitar action ruler are clearly visible, easy to read and identify. Guitar measuring tool includes additional scales for measuring string diameter and general scale measurements, expanding its practical functionality. Key benefits - Precise action measurement for accurate setup on electric and acoustic guitars - Durable metal construction for reliable performance over time - Clear, easy to read scale for quick measurements - Multiple measurement options including string diameter and general scale 2-3 use scenarios - Before and after restringing or setup to achieve consistent string height across all strings - In a workshop or studio during guitar maintenance to verify string gauge suitability and overall scale measurements - For techs and luthiers to compare action and string parameters across instruments during setup or repair