Portable
Thermo
‐
Hygrometer
Operation
Manual
98871/98873/98874/98875/98877
The
meter
simultaneously
measures
and
displays
Temp.
and
RH
,calculate
dew
point,
wet
bulb
temperature
in
seconds.
Easy
operation,
meter
powered
by
three
1.5
volt
batteries,
receptacle
device
is
built
‐
in
for
tripod
mountable
enable
to
do
long
time
logging
purposes.
SPECIFICATION:
Temp.
range:
‐
20~50C
(
‐
4~122F)
,
accuracy
:
±
0.6C
RH%
range:
0.1~99.9%
,
accuracy:
±
3%(10~90%RH),
others
±
5%RH
Temperature
measurement:
Ambient
Temp.
Dew
Point
Temp.
Wet
Bulb
Temp.
Heat
index,
WBGT
temperature
measurement(98875.98877)
High/Low
Temp.
&
RH
alarm
threshold
setting
Function:
Maximum,
Minimum
,
Average
and
Recall
Manually
record
up
to
99
points
in
meter(98873.98874.98877)
On
line
recording
up
to
64,000
points
to
PC(98875)
Dimension:
160x60x40mm
(
Meter
),
Sensor
tip
(
31mm)
Power
:
AAA
Volt
battery
x
3
pcs
Self
‐
calibration
RH%
(
Optional
function
)
Back
‐
light
function(Optional)
External
probe
temp(98874
only)
Supplied:
Battery
,
Meter
,
operation
manual.
USB
cable
.
On
line
logging
software(98875
only)
EXT.
probe
(98874
only)
Portable
meter
Main
screen
of
on
line
logging
KEY
PAD
PWR.
Turn
on
or
off
,
bell
icon
activate
HOLD
Freeze
current
readings.
Forward
review
or
Increase
digit
Backlight
Optional
(
Backlight
function)
.
Decrease
digit
and
Back
review.
Max.Min.
Review
Max.
Min.
AVG
readings
and
toggle
RH,
Temp.
Hi,Lo
alarm
threshold
setting
MODE.
Toggle
Temp.
DP.
WB
temperature
display.
Recall
99
points
memory
data,
EXT.
temp.
mode.
SET.
Manually
record
99
memory
point
in
meter.
Enter
Hi.Lo
alarm
threshold
setting
and
save
to
escape.
Unit.
Toggle
Temperature
unit
C
and
F.
While
Hi.Lo
setting,
toggle
Temp.
RH
setting
mode.
SPECIFICATION
98871
98873
98875
98874
98877
Temp.
range
‐
20.0~50.0
℃
(
‐
4.0~122.0
℉
)
Accuracy
±0.6
℃
External
Temp.
probe
N/A
32.dx150mm
probe
External
Temp.
range
N/A
‐
40~100
℃
RH%
range
0.1%~99.9%
Accuracy
±3%(10~90%),others
±5%
HI/WBGT
Temp.
N/A
YES
N/A
YES
DP/WB
Temp.
N/A
YES
Self
‐
Calibration
N/A
Optional
YES
HI/LO
Alarm
N/A
YES
Memory
N/A
99poin
ts
Online
64000
points
99points
USB
interface
N/A
YES
N/A
Operating
Temp.
&RH%
0~50
℃
,<80%RH
Power
AAA
x3
pcs
Meter
size
160x55x29mm(Meter),
Sensor
tip(31mm)
OPERATION
POWER
ON/OFF:
Short
press
”PWR”
button
to
turn
on
the
meter,
press
and
hold
for
2
seconds
to
turn
off
the
meter.
MAX/MIN/AVG:
Short
press
MAX/MIN
button
to
cycle
display
Maximum
,
Minimum
,
Average
Temperature
and
RH
from
powered
on.
CHANGE
DEGREE
℃
/
℉
:
Short
press
UNIT
button
to
switch
℃
and
℉.
DP/WB/HI/WBGT:
Short
press
MODE
button
to
toggle
current
temperature,
DP(Dew
point),
WB(Wet
bulb
temperate)
HI(Heat
index),
WBGT
at
the
second
layer(98875.98877only)
。
EXT
TEMP.(98874
only):
Long
press
MODE
to
show
EXT.
Temp.
RECORD
99
points(98873/98874/98877
only):
Short
press
“
SET
”
button
to
save
current
readings
(
Temp.
RH),
REC
icon
shows
next
to
RH%
reading
and
record
number
shows
next
to
Temperature
reading
about
2
seconds
then
disappear.
Meter
may
store
up
to
99
points.(98873.98874.98877
only)
Recall
recorded
data:
press
and
hold
“
MODE
”
button
to
review
memory
Temp.
RH
and
record
number,
keep
pressing
HOLD
button
to
review
next
data
,
press
BKLT
button
to
review
back
the
last
data.
Long
press
“
MODE
”
button
again
,
to
escape
memory
function
.
CLEAR
MEMORY
:
Under
data
record
long
press
SET
button
to
clear
the
memory.
FREEZE
READING:
Short
press
“
HOLD”
button
under
normal
measurement,
HLD
icon
shows
on
screen
to
freeze
current
readings.
BACKLIGHT:
