EXTECH
INSTRUMENTS
4
CTH10A
‐
en
‐
GB_V2.3
10/15
Daily
Alarm
Setting
Press
“MODE”
button
(B2)
to
view
the
Alarm
Time,
“AL”
is
shown
on
the
display.
When
viewing
the
Alarm
Time,
hold
“MODE”
button
(B2)
for
3
seconds
to
enter
the
Alarm
Time
setting
mode.
Press
“+”
(B3)
or
“
‐
”
(B4)
button
to
adjust
the
alarm
time.
Press
the
“MODE”
button
(B2)
to
confirm
the
setting
and
move
to
the
next
setting.
Press
“AL
ON/OFF”
Button
(B6)
to
activate
or
deactivate
the
alarm.
If
the
alarm
is
on,
the
alarm
icon
"
"
appears
on
the
display.
Snooze
Alarm
Press
the
“SNOOZE”
(B1)
button
when
the
alarm
tone
sounds.
The
alarm
snoozes
for
approx.
5
minutes,
after
which
time
it
alerts
again.
“
”
flashes
on
the
LCD
during
the
snooze
time.
This
process
can
be
repeated
7
times.
Except
for
the
“SNOOZE”
button,
any
button
can
be
pressed
to
stop
the
snooze
alarm.
Otherwise,
the
alarm
signal
sounds
for
2
minutes,
then
stops
automatically.
12/24
Hour
Display
Mode
Press
the
“12/24”
(B3)
button
to
select
the
12
or
24
hour
mode.
Thermometer
and
Relative
Humidity
Displays
The
CTH10A
includes
internal
temperature
and
relative
humidity
sensors.
Temperature
and
relative
humidity
measurements
are
displayed
on
the
lower
right
side
of
the
clock.
Press
the
“°C/°F”
(B4)
button
to
select
C:
Celsius
or
F:
Fahrenheit
units.
If
the
temperature
exceeds
the
measurable
range,
LL.L
(beyond
the
minimum
temperature)
or
HH.H
(beyond
the
maximum
temperature)
will
be
shown
on
the
LCD.
Important
Notes
The
clock
loses
time
information
when
the
batteries
are
removed.
Do
not
expose
the
Clock
to
direct
sunlight,
extreme
temperatures,
or
high
humidity
Never
clean
the
device
using
abrasive
or
corrosive
materials
or
products.
Use
a
damp
cloth
to
wipe
the
housing
clean
as
necessary.
