The Ghost Meter
The most basic instrument for ghost hunting is the EMF Meter. Light and compact, the Ghost Meter is an easy to use EMF meter for your paranormal research. Theories suggest that when paranormal activity is present, electromagnetic energy occurs in the environment. This meter has a needle readout and an audio tone which allows you to use it in the dark. When using the Ghost Meter, look for readings that are random, that come and go without explanation, as these are the ones that indicate paranormal activity. The Ghost Meter operates on one 9 volt battery.
As always it is up to the user to determine whether readings are showing intelligent patterns that can be suspected to be of paranormal nature. Always keep in mind that meters read the environment so there could always be a natural explanation to a reading. This has to always be ruled out before concluding that any readings are of paranormal nature.