Abstract
Electric moisture meters for wood measure electric conductance (resistance) or dielectric properties, which vary fairly consistently with moisture content when it is less than 30 percent. The two major classes of electric moisture meters are the conductance (resistance) type and the dielectric type. Conductance-t ype meters use penetrating electrodes that measure in a small volume, so moisture gradients may be deduced by repeated measurements at increasing depths. Dielectric-type meters use surface electrodes that do not puncture the wood surface, and can measure the moisture content of relatively dry wood. This paper describes these major types of meter and includes detailed information on the kinds of electrodes used with each type. Readings of moisture meters are affected by such factors as wood species and temperature, chemical treatments, moisture distribution, and operator skill. This paper contains information for correcting for these factors and for minimizing potential errors.
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