Accu-Pitch verifies intonation by sounding a note when correct tuning is reached -Versatile modes: Drop D, Open D/E/G/A, DADGAD and flat tunings up to 5 semitones -World?s first Octave Adjust function simplifies tuning using open string and 12th fret -High impedance input keeps tuner transparent when connected between guitar and amp -Backlit needle and LCD let guitarists tune up anywhere