Ghost hunters use a variety of techniques and tools to investigate alleged paranormal activity. While there is no universal acceptance among ghost hunters of the following methodologies, a number of these are commonly utilized by ghost hunting groups.
* Still photography and video: using digital, night vision, infrared, and even disposable cameras.
* EMF meter: to detect possibly unexplained fluctuations in electromagnetic fields.
* Tablet PC: to record data, audio, video and even environmental fluxuations such as electromagnetic fields.
* Ambient temperature measurement: using thermographic cameras, thermal imaging cameras, infrared thermometers, and other infrared temperature sensors.
* Digital and analog audio recording: to capture any unexplained noises and electronic voice phenomena (EVPs), that may be interpreted as disembodied voices.
* Geiger counter: to measure fluctuations in radiation.
* Ion meters: to detect an excess of negative ions.
* Infrared and/or ultrasonic motion sensors: to detect possible anomalous movement within a given area, or to assist in creating a controlled environment where any human movement is detected.
* Air quality monitoring equipment: to assess the levels of gases such as carbon monoxide, which are thought to contribute to reports of paranormal activity.
* Infrasound monitoring equipment: to assess the level of sound vibrations.
* Dowsing rods: usually constructed of brass and bent into an L-shape.
* Psychics, mediums, or clairvoyants: trance mediums or "sensitive" individuals thought to have the ability to identify and make contact with spiritual entities.
* Demonologists, exorcists, and clergy: individuals who may say prayers, give blessings, or perform rituals for the purpose of cleansing a location of alleged ghosts, demons, poltergeists, or "negative energy."
* Lights out: according to ghost hunting enthusiast websites, many ghost hunters prefer to conduct their investigations during "peak" evening hours (midnight to 4 a.m.).
* Ovilus/Ghost Box: These devices are used by some investigators to provide a possible one-on-one conversation with the dead, although they are experimental in nature.
* Interviews: collecting testimony and accounts about alleged hauntings.
* Historical research: researching the history behind the site being investigated.
K-II Meter - Electromagnetic fields, or EMFs, are emitted by electrical devices of all types. EMFs are everywhere, originating from appliances, cell phones, electrical wiring, and even the human body.
The K-II EMF Meter helps measure these fields to identify appliances that produce high-level emissions, allowing users to make informed decisions about limiting exposure.
EMF fluctuations have also been associated with locations where unexplained phenomena have been reported, including alleged hauntings. K-II meters generally operates on a single 9V battery, and many report EMF measurements in five milliGauss ranges.
EMF Gauge (detector) is a common device used in the detection of ghosts and spirits during ghost hunting.
The theory behind this device is that spirits are energy and this device picks up energy which may result in evidence that there is a spirit lingering around the ghost hunter.
This device can pick up normal explainable energy such as other electronic devices, power lines, circuit breakers, etc. An electromagnetic field is a physical field which is produced by electrically charged objects.
Digital Voice Recorders are used to help further evidence of spirits by recording what is called an EVP. An EVP is defined as: a voice or sound that is picked up an electronic device which was not heard by human ears.
This type of noise is only heard through technology such as a digital recorder and never from a human ear. EVP's may provide further proof that there is some form of energy attempting to communicate.
EVP's can be random noises, voices and in even some circumstances they can be responses to physical questions.
Thermal Imaging Cameras are used to help provide evidence of the paranormal field by detecting energy (heat) which the human eye may not be able to see.
Another theory of spirits is that since they may contain energy that they will in return have heat.
Cold spots is another theory that suggests that these spirits absorb energy around them to manifest themselves which in turn they create a cold spot within the surroundings.
Infrared Cameras are used in ghost hunting to view spirits that sometimes cannot be seen with the human eye. The theory is that spirits are more easier seen through IR light rather then UV light.
Another theory states that spirits move more quickly through our dimension and because of this a high speed object would be easier to film using a high frequency short wave source and that composition of spirits may be more sensitive to reflecting IR light.
Controlled Object - This is a technique used in ghost hunting to try and determine if a physical object has moved.
There are many ways and techniques of doing this for example placing pieces of tape where the legs of a chair touch the floor and to later see if the chair has moved away from the pieces of tape.
Of course physical evidence is necessary such as filming the controlled object since this would increase the evidence rather then it just be hearsay and another story.
Ghost Box is a device that is completely homemade from an AM/FM radio and is used to communicate with the dead.
Although most Ghost Boxes can be modified to open scan in both the AM and FM bands the AM bands tend to provide better results.
A Ghost Box creates white noise mixed with actually radio stations and the theory is that spirits can use this white noise and chatter from radio stations to actually manipulate into audible words to establish communication.