USER
GUIDE
Humidity
Alert
Portable
Hygro
‐
Thermometer
with
Dew
Point
Model
RH30
Introduction
Thank
you
for
selecting
the
Extech
Model
RH30.
The
RH30
monitors
relative
humidity,
air
temperature,
dew
point
temperature,
and
MAX
‐
MIN
readings.
The
RH30
also
includes
an
audible/visual
high
humidity
alarm.
This
device
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
the
Extech
Instruments
website
(www.extech.com)
to
check
for
the
latest
version
of
this
User
Guide.
Extech
Instruments
is
an
ISO
‐
9001
certified
company.
Safety
General
Safety
o
Please
read
all
safety
and
instructional
information
before
using
this
product.
o
This
product
is
intended
for
home
use
only.
o
Unauthorized
repairs,
modifications,
or
other
changes
to
the
product
are
not
supported.
o
This
product
is
not
intended
for
use
in
medical
practices.
Caution!
Risk
of
Injury!
o
Keep
this
product
and
its
batteries
out
of
the
reach
of
children
and
pets.
o
Batteries
must
not
be
placed
in
fire,
short
circuited,
taken
apart,
or
discharged.
Risk
of
explosion!
o
Batteries
can
be
fatal
if
swallowed.
Contact
medical
emergency
personnel
if
batteries
are
swallowed.
o
Batteries
contain
harmful
acids.
Weak
batteries
should
be
changed
as
soon
as
possible
to
prevent
damage
caused
by
leaking
batteries.
Product
Safety!
o
Do
not
place
this
product
near
extreme
temperatures,
vibration,
or
shock
o
Never
hold
a
probe
directly
in
or
over
fire
o
Do
not
immerse
the
meters
in
any
liquid
