I’ll try this again.
Resistance Meters (Pin Type Moisture Meters)
Commonly known as a pin moisture meter, this type used to be the most widely used meter throughout the world. Two or more pins are pushed directly into the wood in two different spots, and a direct current travels from one pin to the other. This process measures the resistance to the current between pins and correlates that resistance to wood moisture content.Electromagnetic Field Technology, EMF (Pinless Moisture Meters)
Often called a pinless moisture meter, this type measures the moisture content of wood without piercing the wood with pins. An electrical wave is emitted through a sensor pressed against the wood. This creates an electromagnetic field (EMF) the size of the sensor to a depth of .75” to 1.0”, depending on which model is specified. The field behaves differently depending on the amount of moisture present in the wood.
Neither test measures moisture.
It detects apparent moisture due to increase of electrical conductivity and/or density as a result of moisture or any other material that has higher conductivity or density. Nails and corner beads have both.