Trifield Natural EM meter
This is a VERY unique meter, as it does not measure the same EM frequencies as other meters. Most meters measure
EM fields from about 20 hertz to several kHz, but this meter is actually designed to zero out the surrounding static  
field, and measure any minute changes within that field (in both electric and magnetic fields). Because the meter needs
to zero out the surrounding field, it MUST be used in a stationary position (if you're holding the meter, then the
surrounding field is always changing, and the meter won't be able to stabilize).
The TriField Natural is calibrated at 2 hertz, and will measure changes all the way down to lim(x->0)x hertz (basically,
anything *slightly* above 0 hertz, but not 0 hertz).  Another important thing to note about this meter is that it is NOT
a three axis meter, as many seem to believe, it is a one axis meter (the axis of sensitivity is along the length of the
meter). The TriField Natural Meter will also measure RF/Microwave fields directly.


For an excellent article on the operation of EMF meters click HERE.