A multi-scale fingerboard (also called multiple scale length fretboard) is an instrument fretboard which incorporates multiple scale lengths. The scale length is the vibrating length of the strings. Guitars, including bass guitars, generally employ a single scale length for all of the instrument's strings, though the employed scale length varies significantly between manufacturers (electric guitar scale typically falls between 24" and 25.5"). This measure is the effective length of each of the vibrating strings, not counting compensation for adjusting intonation.