This Halloween, skip the costume party and take your girlfriend ghost hunting in a graveyard. Of course, to be good ghostbusters you need the proper tools: a camera and a device capable of detecting the supernatural. The TriField Natural EMF Meter ($200 plus shipping) is a handheld gadget designed to measure static electric, radio-microwave and magnetic fields.
Parapsychologists use these meters to detect electrical shifts that may signal the movement of something invisible to the naked eye. When the dial is set to electric, the TriField Meter is sensitive to fields as weak as three volts per meter (roughly the energy required to lift a grain of salt 1/50"). So you won't confuse your refrigerator with a creature from beyond, the meter is calibrated to account for "background noise" caused by power lines, appliances and other objects. For hunting spirits in total darkness, the meter emits a squelching tone to signal changes in the reading. To use the meter properly, point it in a specific direction or set it on a tombstone. When it signals a change, snap a photo and see what develops.
—Jason Buhrmester
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