Guitar Action Ruler Durable metal construction is designed for demanding conditions in workshops or on the go, providing long-lasting performance. Key benefits - Accurate string spacing measurement: measures the distance between the guitar strings and the neck to enable precise string spacing. - Clear scales: the guitar action scale and graduations are clearly visible, easy to read, and quick to identify. - Multi-function tool: includes a scale for measuring string diameter and a general ruler, offering additional practical measurement options. 2-3 practical use scenarios - In a guitar setup or repair to verify and adjust string spacing and action height on both electric and acoustic guitars. - When changing strings, to ensure spacing remains consistent with the instrument’s specifications after installation. - In field work or teaching environments to quickly measure string diameter and perform basic dimensional checks during nut or saddle work.