Tenmars TM-195, User Manual

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λ (wavelength) = C (speed of light) / f (frequency)
If the distance to the field source is less than three wavelengths,
then we are usually in the near field. If the distance is more than
three wavelengths, the far-field conditions usually hold.
In near field conditions, the magnetic field value cannot be
calculated from the electric field value. This meter is designed
for reliable far field measurements only.
EN-4