4
The “breath hold” timer will now count down from 15
seconds. Encourage the subject to hold the breath until
the unit beeps to start the test. The display will show the
blow icon.
The subject should place their lips around the cardboard
mouthpiece and blow gently and continue blowing until
their lungs are completely empty. CO is collected in the
last portion of the breath (alveolar breath).
Test Reading Display
The CO Check will beep and show the final reading in
PPM (parts per million).
By pressing the Select Function key
the reading
changes to %COHb (carboxyhemoglobin).
Pressing
again reverts back to PPM.
The maximum reading the CO Check+ can
measure is 99 PPM. Any reading above that will be
displayed as - - (over range).
