Usage: measure the height of strings, the height of bridge saddle, the depth of saddle groove, the depth of lattice groove and the height of nut, and accurately measure other settings and adjustments. Double-sided: the ruler is double-sided with decimal, decimal and metric conversion tables on the back. The function conversion table of strings with the 12th character printed on the front. The back is used to adjust the chord distance. Material: hard plastic, , clear figures. Size: 54mmx85mmx1mm Weight: about 6g Scope of application: suitable for all kinds of guitars, such as electric guitar, acoustic guitar and bass guitar (including six-string bass guitar), mandolin, banjo and so on. Usage: Just put this card on the strings, and you can intuitively find the appropriate height of the strings. Colour:White Material:Plastic Package Contents: 12 * plastic chord distance 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.