CareFusion BabyCO Meter, Operating Manual

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 In order to stop any gas leak from the can after calibration,
ensure that the control knob is tightened firmly.
Battery Life
Battery life is approximately 30 hours of continuous use.
When the battery has approximately 1 hour of useful life left the
alarm will sound momentarily after the unit is first switched on and
the following message will be displayed:
When the battery has completely expired the above will be displayed
continuously and the battery must be replaced.
Battery Replacement
Locate the sliding cover situated on the rear of the unit, towards the
bottom of the device.
Place your thumb over the round thumb indent, press gently and
slide the cover to the right to remove it from the unit.
Lift the old battery out, and holding the battery terminal by the
plastic body, pull it off the old battery.
Plug the new battery into the battery terminal, taking care that the
correct polarity is observed.
Push the battery back into the battery holder, and replace the
battery cover onto the guides. Slide the battery cover to the left
until it is fully home.