Aa.c.balanceindicator,a.c.bridge,a.c.currentcalibrator,a.c.currentdistortion,a.c.inducedpolarizationinstrument,a.c.potentiometer,a.c.resistancebox,a.c.standardresistor,a.c.voltagedistortion,a.c.voltagedistortion,Abbecomparator,aberration,abilityofantiprereducedcomponent,ablativethicknesstransducer[sensor],abrasiontestingmachine,absolutecalibration,absolutecoil,absoluteerror,(absolute)errorofmeasurement,absolutegravimeter,absolutegravitysurvey,absolutehumidity,absolutemethod,absolutemoistureofthesoil,absolutepressure,absolute(pressuretransducer,absolutepressuretransducer[sensor],absoluteread-out,absoluteresolution,absolutesalinity,absolutestability,absolutestabilityofalinearsystem,absolutestaticpressureofthefluid,absolutetemperaturescale,absorbance,absorbedcurrentimage,absorptance,absorptiometer,absorptioncell,absorptioncoefficient,absorptioncorrection,absorptionedges,absorptionfactor,absorptionhygrometer,absorptionspectrum,absorptionX-rayspectrometry,Xabsorptivity,absorptivityofanabsorbing,abstractsystem,abundancesensityivity,AC-ACLVDTdisplacementtransducer,acceleratedtest,acceleratingvoltage,acceleration,accelerationerrorcoefficient,accelerationofgravity,accelerationsimulator,accelerationtransducer[sensor],accelerometer,acceptanceofthemassfilter,acceptancetest,[]access,accesstime,accessibility,accessoriesoftestingmachine,accessory(forameasuringinstrument),accessoryhardware,accessoryoflimitedinterchangeability,accumulatederror,accumulatedtimedifference,accumulativeraingauge,accumulator,accuracy,[]accuracyclass,[]accuracylimitfactor(ofaprotectivecurrenttransformer,accuracyofmeasurement,[]accuracyofthewavelength,accuracyrating,acetylene(pressure)gauge,acetyleneregulator,acousticamplitudelogger,acousticbeacon,acousticcurrentmeter,acousticelement,acousticemission,acousticemissionamplitude,acousticemissionanalysissystem,acousticemissiondetectionsystem,acousticemissiondetector,acousticemissionenergy,acousticemissionevent,acousticemissionpreamplifier,acousticemissionpulser,acousticemissionrate,acousticemissionsignalprocessor[conditioner],acousticemissionrate,acousticemissionsourcelocationandanalysissystem,acousticemissionsourcelocationsystem,acousticemissionsource,acousticemissionspectrum,acousticemissiontechnique,acousticemissiontransducer[sensor],acousticfatigue,acousticimpedance,acousticlogginginstrument,acousticmalfunction,acousticmatchinglayer,acoustic(quantity)transducer[sensor],acousticratio,acousticreleaser,acousticresistance,acousticthermometer,acoustictidegauge,acoustictransponder,acousticalfrequencyelectric,acousticalhologram,acousticalholography,acousticalholographybyelectron-beamscanning,acousticalholographybylaserscanning,acousticalholographybymechanicalscanning,acousticalimagingbyBraggdiffraction,acousticalimpedancemethod,acousticallens,acousticallytransparentpressurevessel,acquisitiontime,actinometer,(active)energymeter,activegaugelength,activegaugewidth,activemetalindicatedelectrode,activeremotesensing,activetransducer[sensor],activity,activitycoefficient,actualmaterialcalibration,actualtimeofobservation,actualtransformationratioofvoltagetransformer,actraltransformationratioofcurrenttransformer,actualvalue,actualvoltageratio,actuator,actuatorbellows,actuatorload,actuatorpowerunit,actuatorsensorinterface(ASI),actuatorshaft,actuatorspring,actuatorstem,actuatorstemforce,actuatortravelcharacteristic,adaptationlayer,adaptivecontrol,adaptivecontrolsystem,adaptivecontroller,adaptiveprediction,adaptivetelemeteringsystem,adder,additionmethod,additionalcorrection,additivityofmassspectra,address,adiabaticcalorimeter,adjustbuffertotalionstrength,adjustablecisternbarometer,adjustablerelativehumidityrange,adjustabletemperaturerange,adjustedretentiontime,adjustedretentionvolume,adjuster,adjustment,adjustmentbellows,adjustmentdevice,adjustingpin,adsorbent,adsorptionchromatography,aerialcamera,aerialremotesensing,aerialsurveyingcamera,aerodynamicbalance,aerodynamicnoise,aerograph,aerogravitysurvey,aerometeorograph,aerosol,agingofcolumn,agitator,agriculturalanalyzer,air-bornegravimeter,aircapacitor,airconsumption,airdamper,air-deployablebuoy,air-dropautomaticstation,airduct,airgun,airinlet,airlock,air-lockdevice,airoutlet,airpressruebalance,airpressuretest,airsleeve,airtemperature,air-tightinstrument,airtoclose,airtoopen,airborneelectromagneticsystem;AEMsystem,airborneflux-gatemagnetometer,airbornegammaradiometer,airbornegammaspectrometer,airborneinfraredspectroradiometer,airborneopticalpumpingmagnetometer,airborneprotonmagnetometer,airborneXBT,airguncontroller,airmeter,alarmsummerypanel,alarmunit,albedograph,alcoholthermometer,algorithm,algorithmiclanguage,alidade,alignmentinstrument,alkaliflameionizationdetector(AFID),alkalineerror,alkalinityofseawater,all-skycamera,all-weatherwindvaneandanemometer,allocationproblem,allowableloadimpedance,allowablepressuredifferential,allowableunbalance,alphaspectrometer,αalternating[exchange]load,alternating-currentlinearvariabledifferentialtransformer(AC-ACLVDT),alternatingtemp