How ghost hunters use EMF meters
An EMF meter is an instrument that reads the fluctuation in electromagnetic fields. You should always take preliminary EMF readings at various places throughout the site. The locations of power lines, appliances and other sources of electromagnetic fields are also noted. Most normal readings are in the range of 9.0 – 30.0 on the EMF meter. These are typical EMF readings in a home. Anything that registers in the 2.0 to the 7.0 ranges and cannot be traced to a source is attributed to spirit activity. An example of a source would be a computer monitor. The closer you get to a natural source the higher the reading. A natural source should always appear in the same place and will not disappear. You should discard these readings.
When you get a short EMF reading in the 2.0