jordan
Now I see why you were asking about EMF or EF. Different products use the term "EMF" differently. For example, the trifield says AC magnetic field (units of milligauss).
Hard to say in my personal experience if it is EMF, EF, RF, dirty electricity or all of the above as trigger. How do you feel about using these displays you are testing at a greater distance than normal away? As you know, the intensity drops off (attenuates) with distance.