The Fender DTP-100 is a pedal tuner which also features a removable tuner module for added versatility. Other features include LED indicators, high quality built-in microphone for acoustic tuning, 4 modes of operation; normal mode (440 Hz), calibrate mode (435 Hz-445 Hz), Auto mode (automatically calibrates to an external signal source), and flat tuning mode (calibrates flat one semitone to 7 flats (a fifth) lower than standard). 2 output selections for muted or straight signal when tuning, and a last function memory recall when turning on and off.