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Compass--This equpment is good so you know what direction you are going in, or what side of the room or area you took readings in/at. It can also be used like the EMF meter. It has been known that paranormal phenomena can alter the accuracy of a compass, so if you are pointing north and the compass needle moves to east and back to north, (or whatever direction) you mave have paranormal phenomena in that area.
That said, compasses do vary slightly from place to place and time to time. Sometimes they respond to nearby bodies of iron ore, or places where lightning strikes have magnetized rock outcrops. Sometimes geomagnetic storms, like those that cause auroras, make compass needles fluctuate. There are also the dimly understood elctrical currents, called telluric currents, that flow deep underground where rocks can conduct electricity.
But compasses also are affected by human causes, like electric power lines. (Remember your middle-school physics class: moving magnets generate electricity in a wire coil, and vice versa—that's how electric motors work.) Electrically powered trains send out powerful magnetic noise. And natural electromagnetic forces can interact in odd ways with large structures like pipelines or bridges.
But remember that "mystery spots" are, at root, no different from magicians' acts or amusement parks. It would be trivial to bury electric wires around a "mystery house" and disrupt compasses at will. If you suspect trickery—and in human affairs you always should—it would take a careful and skeptical study to investigate this subject.