EXTECH
INSTRUMENTS
3
CO50
‐
en
‐
GB_V1.2
12/14
Meter
Description
Button
Description
SET
Button:
Set
date
and
time
Audible
Alarm
ON/OFF
(SET+MODE)
Alarm
Limit
Adjustment
Toggle
the
time
format
(12/24
clock)
SEL/RECALL
Button:
Move
to
next
digit
Short
press
to
save
current
reading
Long
press
to
recall
stored
reading
C/F/%RH
Button
with
up
arrow:
Increase
a
value
Press
and
hold
to
switch
temperature
units
MODE
Button
with
down
arrow:
Decrease
a
value
Review
Maximum
(MAX)
reading
Meter
Description
1.
Top
LCD
display
for
CO
concentration
2.
Middle
LCD
display
for
RH
and
temperature
3.
Bottom
LCD
display
Time
and
Date
4.
Power
Adaptor
jack
5.
Push
‐
button
controls
6.
Multicolor
LED
indicator
light
LED
Indicator
Description
When
meter
is
powered
on
the
LED
is
illuminated
orange
In
normal
mode
with
meter
ON,
LED
is
not
illuminated
Each
time
a
reading
is
stored
in
memory
the
LED
flashes
green
and
the
audible
beeper
sounds
When
the
alarm
is
tripped
the
LED
flashes
red
and
the
audible
beeper
sounds
1
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3
4
5
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