The odd sibling in the TriField family, and the one ghost hunting groups ask for by name. Instead of measuring the strength of a mains field, it watches for changes in static magnetic and electric fields and stays quiet when nothing moves. Any shift raises a tone whose pitch tracks the rate of change, so an investigator can keep eyes on a room and ears on the meter. Man made 50 to 60 Hz sources are largely ignored, which is exactly the point.
Useful in old houses where a conventional meter screams at every cable run. Less useful outdoors in a thunderstorm or in a moving car, since the sensor also reacts to its own motion: it has to sit still on a solid surface. Sensitivity is high enough that a hand passing nearby can trigger the tone, so patience matters more than gadget lust here.
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