With the TU-02, you can tune a variety of instruments. It offers standard tuning modes for guitar, 4- and 5-string bass, and ukulele, as well as a chromatic mode for alternate tunings and other stringed instruments. Flat tuning over a range of two semitones down is supported, perfect for players who like to tune low for a heavier sound. And with adjustable calibration from 430 to 450 Hz, you can set the tuner to a reference other than the default 440 Hz standard if needed.