This Pedal is discontinued.
MG ID: 11538
Tuner
Reference Pitch: A4 = 438 to 445Hz (1Hz step)
Tuning Range: C0 (16.35 Hz) to C8 (4186.00 Hz)
Tuning Accuracy: +/-3 cent
Input Impedance: 1 M ohms
These merchants probably sell this module. Huh?