Guitar String Action Gauge String Pitch Ruler Card Luthier Tool Ruler Guitar Measuring Tool for Classical Electric Acoustic Guitar Bass Features: It is compact, portable and easy to carry. Various calibrations on the positive and negative sides can measure various spacing and have complete functions. Made of synthetic plastic, very durable. Suitable for classical guitar, electric guitar, acoustic guitar, bass and other string instruments. Specifications: Material: Synthetic plastic Compatibility: Measurement of classical/ electric/ acoustic guitar, bass and other string instruments Item Size: 8.5 * 5.4 * 0.1cm / 3.34 * 2.12 * 0.039inch (L * W) Item Weight: 5g / 0.18oz Package Size: 12 * 8 * 0.2cm / 4.7 * 3.1 * 0.08inch Package Weight: 7g / 0.25oz Front Function: 1. 80mm scale. 2. Classical Guitar 12/14 product chord from the default value (Classic Guitar). 3. 4/5/6 string bass 12/14 product chord from the default value (Bass Guitar). 4. Electric guitar 12/14 product chord from the default value * lower limit (Electric Guitar Low). 5. Electric guitar 12/14 product from defaults string * upper limit (Electric Guitar High). 6. Acoustic Guitar 12/14 product chord from the default value (Acoustic Guitar) . Back Function: 1. The first product fingerboard width 40mm, 42mm, 45mm measured value and the pitch of the strings. 2. The first product fingerboard width 38mm, 41.5mm, 43mm measured value and the pitch of the strings. 3. The first product fingerboard width of 50mm (Classic, Classic), 45mm (5 string bass), 38mm (4-string bass) and string spacing measurements. 4. The first product fingerboard width of 52mm (Classic, Classic), 42mm (4 string bass), 40mm (4-string bass) and string spacing measurements. Package List: 1 * String Pitch Ruler Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.