
PortableThermo‐HygrometerOperationManual
98871/98873/98874/98875/98877
ThemetersimultaneouslymeasuresanddisplaysTemp.andRH,calculatedewpoint,wet
bulbtemperatureinseconds.Easyoperation,meterpoweredbythree1.5voltbatteries,
receptacledeviceisbuilt‐infortripodmountableenabletodolongtimeloggingpurposes.
SPECIFICATION:
Temp.range:‐20~50C(‐4~122F),accuracy:±0.6C
RH%range:0.1~99.9%,accuracy:±3%(10~90%RH),others±5%RH
Temperaturemeasurement:AmbientTemp.DewPointTemp.WetBulbTemp.
Heatindex,WBGTtemperaturemeasurement(98875.98877)
High/LowTemp.&RHalarmthresholdsetting
Function:Maximum,Minimum,AverageandRecall
Manuallyrecordupto99pointsinmeter(98873.98874.98877)
Onlinerecordingupto64,000pointstoPC(98875)
Dimension:160x60x40mm(Meter),Sensortip(31mm)
Power:AAAVoltbatteryx3pcs
Self‐calibrationRH%(Optionalfunction)
Back‐lightfunction(Optional)
Externalprobetemp(98874only)
Supplied:Battery,Meter,operationmanual.USBcable.Onlineloggingsoftware(98875
only)EXT.probe(98874only)
PortablemeterMainscreenofonlinelogging
KEYPAD
PWR.Turnonoroff,belliconactivate
HOLDFreezecurrentreadings.ForwardrevieworIncreasedigit
BacklightOptional(Backlightfunction).DecreasedigitandBackreview.
Max.Min.ReviewMax.Min.AVGreadingsandtoggleRH,Temp.Hi,Loalarmthreshold
setting
MODE.ToggleTemp.DP.WBtemperaturedisplay.Recall99pointsmemorydata,EXT.
temp.mode.
SET.Manuallyrecord99memorypointinmeter.EnterHi.Loalarmthresholdsetting
andsavetoescape.
Unit.ToggleTe mperatureunitCandF.WhileHi.Losetting,toggleTemp.RHsetting
mode.
SPECIFICATION
9887198873988759887498877
Tem
.ran
e‐20.0~50.0
‐4.0~122.0
Accurac
±0.6
ExternalTem
.
robeN
A32.dx150mm
robe
ExternalTem
.ran
eN
A‐40~100
RH%ran
e0.1%~99.9%
Accurac
±3%
10~90%
,others±5%
HI
WBGTTem
.N
AYESN
AYES
DP
WBTem
.N
AYES
Sel
‐CalibrationN
AO
tionalYES
HI
LOAlarmN
AYES
MemoryN/A99poin
tsOnline64000points99points
USBinterfaceN
AYESN
A
O
eratin
Tem
.&RH%0~50
,<80%RH
PowerAAAx3
cs
Metersize160x55x29mm
Meter
,Sensorti
31mm
OPERATION
POWERON/OFF:
Shortpress”PWR”buttontoturnonthemeter,pressandholdfor2secondstoturnoffthe
meter.
MAX/MIN/AVG:
ShortpressMAX/MINbuttontocycledisplayMaximum,Minimum,AverageTemperature
andRH
frompoweredon.
CHANGEDEGREE℃/℉:
ShortpressUNITbuttontoswitch℃and℉.
DP/WB/HI/WBGT:
ShortpressMODEbuttontotogglecurrenttemperature,DP(Dewpoint),WB(Wetbulb
temperate)HI(Heatindex),WBGTatthesecondlayer(98875.98877only)。
EXTTEMP.(98874only):
LongpressMODEtoshowEXT.Temp.
RECORD99points(98873/98874/98877only):
Shortpress“SET”buttontosavecurrentreadings(Tem p.RH),RECiconshowsnexttoRH%
readingandrecordnumbershowsnexttoTemperaturereadingabout2secondsthen
disappear.Metermaystoreupto99points.(98873.98874.98877only)
Recallrecordeddata:pressandhold“MODE”buttontoreviewmemoryTem p.RHand
recordnumber,keeppressingHOLDbuttontoreviewnextdata,pressBKLTbuttonto
reviewbackthelastdata.
Longpress“MODE”buttonagain,toescapememoryfunction.
CLEARMEMORY:
UnderdatarecordlongpressSETbuttontoclearthememory.
FREEZEREADING:
Shortpress“HOLD”buttonundernormalmeasurement,HLDiconshowsonscreento
freezecurrentreadings.
BACKLIGHT: