Description: Different Options: We provide digital guitar string action gauges of different base options, suitable for different types of guitars, acoustic, electric, classical guitars, flat fingerboard guitars, ukuleles, choose according to your need Sturdy Construction: Crafted from brass or aluminium base, this string height measurement tool ensures longevity and reliability Precision Digital Display: This string action gauge ruler features a digital display, accurately measure string height, switchable between inch/mm with a 0.005" / 0.01mm accuracy Compact Size: Base measures 2.2x2.35 cm, the upgraded base design aligns perfectly with the fingerboard's curvature (16R/9.5R/flat), easy to handle, providing accurate measurements Guitar Luthier Tool: Guitar String Measuring Tool is great for both professional luthiers and DIY enthusiasts, essential tool for accurate guitar maintenance and setup Specification: Material: Brass, Metal, or Aluminium (Optional) for 16 inch Radius, suitable for Acoustic Guitar or for 9.5 inch Radius, suitable for Electric Guitar Or Flat Base, suitable for Flat Fingerboard Guitars Instruments   Size Chart: Brass/Aluminium Base: 2.2cmx2.35cm/0.87inchx0.93inch Package Includes: 1 Guitar String Action Gauge ( As you choose) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.