Micro Direct CO Check Pro Operating Manual page 6

The maximum reading the CO Check Pro can measure is 99 PPM.
Any reading above that will be displayed as - - (which means it's
over the range).
Colored lights are there to represent and provide a visual display of the
resulting PPM reading. The colored lights represent the following:
After
readings, the
either be switched off using the ON/OFF Power key
measurement can be carried out by pressing the Select Function
for at least three seconds.
To save the battery, the device will switch OFF automatically after
three minutes of non-use.
Operation – Environment Mode
Insert the 9V battery by removing the battery cover and clipping the battery
in place then replacing the battery cover. Insert a SafeBreath mouthpiece
(order #FM200); or if not using a SafeBreath mouthpiece, insert the plastic
mouthpiece adapter (order #PSA1800) followed by a cardboard
mouthpiece (order #3301).
Turn on the CO Check Pro by pressing the ON/OFF Power key.
device will display the version number before starting the countdown timer.
The device will countdown for 10 seconds to ensure that the sensor is
stabilized. When the countdown timer reaches zero, it will display the
current environment reading. Press the Select Function Key and
encourage the subject to continue holding their breath until the device
deeps and the blow icon
In the user menu,
0-6 ppm =
7-10 ppm =
11-20 ppm =
20+ ppm =
Green Light
Yellow Light
Red Light
Flashing Red Light
appears.
you can set the breath
5
examining the
device can
, or another
key
The