Investigating teams use numerous different kinds of tools and instruments to communicate and locate paranormal entities. Shown here is a tablet running a ghost radar app and the staple of all investigators: a voice recorder. Typically, investigators will each have a voice recorder that runs during the entire investigation. They will then go back later and listen to the recordings for EVPs or noises made by possible paranormal beings. Many of these EVP recordings are at a different frequency inaudible to humans.
Since many of these recorders are highly sensitive and are able to pick up on even the slightest of noises, sounds caused by the investigators or known outside influences, are “marked.” Marking means to audibly describe what made the noise or to simply point out that the sound came from this realm. Additionally, a guideline followed by many investigators is to never whisper since this could be confused with a paranormal being.