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4 The AIR CAL menu
item will be
displayed.
5 Press and release
the POWER button.
6
Make sure you are in
a fresh air area (area
known to be free of
toxic and
combustible gases
and of normal
oxygen content,
20.9%).
7 Press and hold the
AIR button. Release
the AIR button when
the screen says
“RELEASE”.
8 The instrument will
perform a fresh air
adjustment and will
return to the AIR
CAL menu item.
