EXTECH
INSTRUMENTS
4
FM100
‐
en
‐
GB_v1.7
6/16
ZERO
Calibration
Ensure
that
calibration
is
performed
in
a
clean
air
environment
(no
VOCs
or
HCHO
gases).
Press
and
hold
the
control
button
for
3
seconds
(until
appears
on
the
LCD
screen).
Press
and
hold
the
button
again
to
start
calibration.
Release
the
control
button
and
wait
300
seconds
for
the
calibration
to
complete.
The
meter
will
display
‘END’
for
2
seconds
when
calibration
is
complete
and
will
then
return
to
the
normal
mode
of
operation.
Changing
Temperature
Units
o
C/
o
F
When
is
shown
on
the
display,
press
and
hold
the
control
button
to
display
the
current
temperature
unit.
Momentarily
press
the
Calibration
control
button
to
toggle
°C
and
°F
units.
To
save
setting,
press
and
hold
the
control
button.
The
meter
will
return
to
the
normal
mode.
Temperature
Compensation
Adjustment
When
is
shown
on
the
display,
press
and
hold
the
control
button.
The
factory
default
‘0.0’
value
will
flash.
Turn
the
compensation
potentiometer
clockwise
to
increase
the
temperature
offset
or
counterclockwise
to
decrease
offset).
The
range
is
‐
5.4°F
to
+5.4°F
(
‐
3.0°C
to
+3.0°C).
When
done,
press
and
hold
the
control
button
to
save
the
setting.
The
meter
will
return
to
the
normal
measurement
mode
and
will
reflect
the
offset
when
temperature
readings
are
displayed.
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