K-2 METER
Here at E.V.P. we use the K-II  electro magnetic field (EMF) detector. This particular meter is used by many paranormal groups including TAPS, from the popular tv show Ghost Hunters.
     It is a common belief that spirit manifestations give off a high emf field. By moving closer to the meter an entity can, theoretically, set it off the light meter in response to questions.
    This is one of my favorite tools because it gives instant results and helps understand what is really going on. High emf fields can cause paranoia, nausea, and even cause hallucinations, explaining why some areas may "feel" haunted.