The DT-C2 Dunlop Deluxe Headstock Tuner provides accurate chromatic tuningall the way down to a low B with an easy-to-read four-color display. The DT-C2 frequency is adjustable from 430490Hz, and it features a silent metronome for visual cue practice, Mic and Clip modes for sound or vibration-based tuning, and Flat Tuning mode.Deluxe chromatic tuner.. Four color display tracks quickly and accurately.. Adjustable frequency from 430-490Hz (440Hz by default). Flat tuning mode can be set incrementally up to four semitones below standard tuning..