Designation:D7438−13StandardPracticeforFieldCalibrationandApplicationofHand-HeldMoistureMeters1ThisstandardisissuedunderthefixeddesignationD7438;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeappliestothemeasurementofmoisturecontentofsolidwood,includingsolidwoodproductscontain-ingadditives,thatis,chemicalsoradhesives,byhand-heldmoisturemetersunderconditionsofend-use.1.1.1Thispracticeincludescalibration,use,andinterpreta-tionofmetersforconditionsthatrelatetowoodproductcharacteristics,suchasnonuniformgrainandgrowthringorientation,andtoend-useprocessconditions,suchasmois-turegradients.1.1.2Metersemployingdifferingtechnologiesmaynotprovideequivalentreadingsunderthesameconditions.Whenthispracticehasbeenapplied,itisassumedthatthereferencedmeterisacceptableunlessotherwisespecified.MetersshallhavebeencalibratedbyTestMethodsD4444.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2915PracticeforSamplingandData-AnalysisforStruc-turalWoodandWood-BasedProductsD4442TestMethodsforDirectMoistureContentMeasure-mentofWoodandWood-BaseMaterialsD4444TestMethodforLaboratoryStandardizationandCalibrationofHand-HeldMoistureMetersD4933GuideforMoistureConditioningofWoodandWood-BasedMaterialsD6782TestMethodsforStandardizationandCalibrationofIn-LineDryLumberMoistureMeters2.2OtherASTMSources:ASTMStandardsonPrecisionandBiasforVariousApplications,19923.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1conductancemeters—conductancemetersarethosethatmeasurepredominantlyionicconductancebetweenpointsofappliedvoltage,usuallydirectcu...
