2
CB20-EU-EN-V1.2 5/13
Introduction
Thank
you
for
selecting
the
Extech
Model
CB20
.
This
device
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
our
website
(www.extech.com)
to
check
for
the
latest
version
of
this
User
Guide,
Product
Updates,
and
Customer
Support.
Safety
International
Safety
Symbols
This
symbol,
adjacent
to
another
symbol
or
terminal,
indicates
the
user
must
refer
to
the
manual
for
further
information.
This
symbol,
adjacent
to
a
terminal,
indicates
that,
under
normal
use,
hazardous
voltages
may
be
present
Double
insulation
Safety
Note
Remove
the
battery
if
the
device
is
to
be
stored
for
longer
than
60
days.
Cautions
If
the
equipment
is
used
in
a
manner
not
specified
by
the
manufacturer,
the
protection
provided
by
the
equipment
may
be
impaired.
This
product
is
designed
for
use
by
suitably
qualified
personnel
familiar
with
electrical
supply
systems.
Before
using
this
product,
read
these
instructions
and
safety
warnings.
Failure
to
comply
with
the
safety
warning
or
use
of
the
unit
in
a
manner
not
specified
may
result
in
serious
injury
or
damage
to
equipment.
Use
in
dry
conditions
Before
use
test
that
unit
is
functioning
correctly.
WARNING
:
Refer
all
indicated
problems
to
a
qualified
electrician.