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Moisture meters use what is often referred to as the capacitive method or RF dielectric method. With this method a radio signal at a specified frequency is sent through the sample. As water interacts with radio waves (that's how your microwave oven works) it is possible to determine the moisture content by measuring how much the radio signal is changed by the sample.
The effect that the sample has on the radio signal is termed the dielectric constant, and it increases proportionally to the moisture content. There are a number of other factors that have an effect on the dielectric constant, perhaps most notably sample density and temperature. These two factors are measured and corrected for in advanced moisture meters.
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What is a grain moisture tester used for?
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