It is compact, portable and easy to carry. Various calibrations on the positive and negative sides can measure spacing and have complete functions. Weight:5g Size:8.5x5.4cm or 3.34x2.12Inch Applicability:Measurement of guitar, bass and other instruments Front Function: 1. 80mm scale. 2. Classical Guitar 12 or 14 product chord from the default value (Classic Guitar) 3. 4 or 5 or 6 string bass 12 or 14 product chord from the default value (Bass Guitar) 4. Electric guitar 12 or 14 product chord from the default value x lower limit (Electric Guitar Low) 5. Electric guitar 12 or 14 product from defaults string x upper limit (Electric Guitar High) 6. Acoustic Guitar 12 or 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. Colour: Material:Plastic Package Contents: 1 x Guitar Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.