Boss TU12 Chromatic Tuner
The TU-12 is the tuner that established BOSS quality, reliability and durability as the industry standard.
Reference Pitch A4 = 440 to 445Hz (1Hz step)
Tuning Range C1 (32.70 Hz) to B5 (987.77 Hz)
Tuning Accuracy +/-1 cent
Connectors Input, Output, AC Adaptor Power Supply DC 9 V Dry Battery, AC Adaptor Current Draw 20 mA (max.)