Pitchblack Poly PB-03

Polyphonic Pedal Tuner

Detection Range: E0 (20.60 Hz) ~ C8 (4186 Hz)
Detection Accuracy: +/- 1 cent
Tuning Modes: Mono / Chromatic, Polyphonic / Guitar – Bass (Auto detection)
Display Mode: Regular Meter / Full Strobe / Half Strobe / Split
Calibration Range: 436-445 Hz (1 Hz steps)

When tuner is active, audio output is off.

https://www.korg.com/us/products/tuners/pitchblack_poly/