Honeywell MultiRAE Series User Manual page 166

Press [MODE] to begin calibration. There is a countdown shown in the box. Press [N/-] anytime
to abort the calibration.
Once the countdown is finished, this message is displayed:
Hold your finger over the inlet and allow the countdown to proceed. Press [N/-] anytime to
abort.
When the countdown is finished, the main Dynamic pump stall screen is shown.
Honeywell MultiRAE Series™ 161 User Manual