Extech Instruments MO55 User Manual

MO55‐en‐GB_V1.002/16
5
DisplayLock
PresstheDisplayLockbutton tofreezethedisplayedreading.The iconisvisibleonthe
displaywhenDisplayLockisactive.Press
againtoreturntothenormaloperatingmode.
BeeperON/OFF
ThebeeperdefaultstoON.ToswitchthebeeperOFF,pressandholdtheDisplayLock/Audible
Beeperbutton untiltheicondisappears.Whenthebeeperisactivetheaudiodisplayicon
willbevisible.
Pin‐ModeSelf‐Test
TurnonthemeterandsetthemetertoPinmodeWoodorBuildingmaterialsandthentouch
theelectrodepinstothecontactsthroughtheholesatthetopoftheProtective/Testcap.
Expectedresult:Wood17.0to19.0%;Building15.5to17.5%
Whenthemeterreadsoutsideofthese
rangespleasereplacethebatteryandretry.Ifthemeter
continuestoreadoutsideoftheseranges,themetershouldbereturnedforservice.
PinlessModeComparisonMeasurements
Whileholdingthemeteragainstaknowndrysurface,turnonthemeter.PresstheMode(M)
buttontosteptothepreferredsetting,blinkingwoodorblinkingbuildingmaterialicon.The
meterwillnowread0%(relative/offsetreading).Nowmovethemetertootherareastotestto
findhigher
levelsofmoisture.
Maintenance
BatteryReplacement
Whenthebatterystatusicon appearsemptyorflashing,replacethebattery.
1. Removetherearbatterycompartmentcoverbypushingthecompartmentlatch.
2. Replacethe9Vbatteryobservingcorrectpolarity.
3. Replacethecompartmentdoorsecurely.
4. Disposeofbatteryresponsiblyandwithinapplicablelegalregulations.

Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.
Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriatecollectionsites,the
retailstorewherethebatterieswerepurchased,orwhereverbatteriesaresold.
Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuseris
obligatedtotakeend‐of‐
lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronicequipment.
CareandCleaning 
 Whentheinstrumentisnotinusepleasekeeptheprotectivecapinplace.
 Storethemeterinastable,dust‐freeenvironment;outofdirectsunlight.
 Removethebatteryfromtheinstrumentifthemeteristobestoredforlongperiodsorif
thebatterypower
symbolappearsempty(orflashing)onthedisplay.
 Tocleanthemetercase,wipewithadampclothdonotusesolventsorabrasives.
 Tocleanthepins,wipecarefullywithadampclothtoremoveresidue;allowtodrywell.
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Extech Instruments MO55 Specifications

Measurement Specifications

measurement depth pinless mode	< 25mm (1 in.)
measurement ranges pin mode	5.0~50.0% (wood), 1.4~33.0% (building materials)
measurement ranges pinless mode	0.0~99.9% (for wood and building materials)
resolution	0.1%
accuracy pin mode	± (3% + 5 digits) for ambient conditions 22°C to 25°C (72°F to 77°F)

Power

power supply	One (1) 9V Battery
auto power off	After approx. two (2) minutes
consumption	< 40mA

Operating Environment

operating conditions	5~45°C (41~113°F); 80%RH max.
storage conditions	0~50°C (32~122°F); 85%RH max.
low battery indication	Battery status icon appears empty or flashing

Weight and Dimensions

dimensions	170 x 65 x 30mm (6.7 x 2.6 x 1.2")
weight	120g (4.2 oz.) without battery