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After the optional zero calibration for the O2 sensor, “Calib due day?” is
displayed. Press Y to set a new date, or N to skip.
When setting a new day, Y increases the digit, N decreases the digit,
and @ moves to the next digit. After the third digit is set, the question
mark (“?”) blinks. Press Y to accept the changes. Press N to discard the
changes. Press @ to change the due date.
Calibration Period
The EntryRAE should have a fresh air calibration before each use and
should be fully calibrated:
 no less than every 30 days
 if it does not pass a fresh air reading
 if it does not pass a field calibration.
Operating the EntryRAE 15