Boss Chromatic Tuner TU-2 Owner's Manual page 20

Adjusting the standard pitch
1. Simultaneously press the MODE select
switch and the STREAM/CENT select
switch.
2. The first digit of the currently selected
standard pitch (0, if 440 Hz) will blink in
the note name / string number display.
3. Press the MODE select switch to change
the standard pitch as follows.
20
440 441
439 438
When you press the STREAM/CENT se-
lect switch, the standard pitch will
change as follows.
440 441
439 438
The standard pitch will be memorized
until the power is turned off.
When you turn off the power, the stan-
dard pitch will be reset to 440 Hz.
442 443
445 444
442 443
445 444