The Korg GA-1 is an ultra-compact guitar and bass tuner that's easy to read and lasts over 100 hours on two AAA batteries. Korg's "Sound Out" function lets you tune by ear with selectable reference pitches through the onboard speaker. With separate modes for guitar and bass, support for flat tunings, 7-string guitars, 5- and 6-string basses, the GA-1 is an awesome solution for anyone who needs an accurate tuner small enough to fit in your pocket when the gig is over.