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
Temp. range
Accuracy
External Temp. probe
External Temp. range
RH% range
Accuracy
HI/WBGT Temp.
N/A
DP/WB Temp.
N/A
Self‐Calibration
N/A
HI/LO Alarm
N/A
Memory
99poin
N/A
ts
USB interface
N/A
Operating Temp. &RH%
Power
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:
98875
98874
98877
‐20.0~50.0℃(‐4.0~122.0℉)
±0.6℃
N/A
32.dx150mm probe
N/A
‐40~100℃
0.1%~99.9%
±3%(10~90%),others ±5%
YES
N/A
YES
YES
Optional
YES
YES
Online 64000 points
99points
YES
N/A
0~50℃,<80%RH
AAA x3 pcs
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