Trifield Natural EM Meter Natural EM meter is frequently seen used by well respected paranormal researchers Loyd Auerbach. Meter will not go off at all for electromagnetic fields from electronic equipments, AC fields. It will alert you of extremely weak static fields, these are referred to as DC fields. Choose between electric & magnetic, measure changes in electric or magnetic DC fields @ same time Our reccommendation is for paranormal reaserach is to keep the setting at Electrical.