Lutron Electronics CO2-9914SD Operation Manual page 11

2) Power on the meter by pushing the "Power Button"(3-2, Fig. 1) 2 seconds.
3) Press and hold the " Function Button " ( 3-6, Fig. 1 ) into sequence to
select the measuring function :
At the same time test tow kinds of functions,
and display show four functions reading.
At the same time test four kinds of functions,
and display show four functions reading.
At the same time test four kinds of functions,
and display show four functions reading.
At the same time test tow kinds of functions,
and display show two functions reading.
At the same time test tow kinds of functions,
and display show two functions reading.
Remark :
After select the desired function, power off the meter then power on
again, the meter circuit memory will save the selected unit with
default.
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