The Electromagnetic Field Detector, also known as an EMF, is the modern day ghost researcher's tracking device, a very important piece of equipment.  With this instrument it is possible to locate and track energy sources.   It will detect fluctuations in electromagnetic fields and low strength moving EMF fields that have no source.  It is a common theory that spirits disrupt this field in such a way that you can tell one is present by higher than normal readings with this meter.  Before using the EMF as a ghost research tool on an investigation be sure to walk around the area and take initial readings around energy sources such as light poles or electrical outlets to be sure of the readings you receive while scanning the area during the investigation.  Most units when purchased come with a manual describing most household and major appliances and their corresponding electromagnetic reading.   When using the EMF as a tracking device look for fluctuations of 2.0 to 7.0, this usually indicates spirit presence.  Anything higher or lower normally has a natural source.  (Troy Taylor)