: This guitar tone calibrator is made of high quality metal, and stable in performance. Portable: guitar accessory is , easy and convenient to carry indoor, outdoor. Feature: guitar octave correction function, it can help you accurately adjust the pitch of the guitar to the most accurate tone. Usage: The pitch calibrator can help you quickly and accurately adjust the tone of the guitar, easy to operate without professional skills. Perfect Gifts: an ideal choice for electric guitar enthusiasts. Size Chart:7.5cmx1.1cmx2.3cm/2.95inx0.43inx0.91in Colour:Silver Material:Metal Package Contents: 1 * Guitar Tone Calibrator 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.