Equipment we use
EMF Meters (Electro Magnetic Field)
The assumption is that paranormal activity can be registered as spirit energy harnesses electro-magnetic energy and therefore EMF meters have come into play. There are degrees of refinement and field ranges in the models available and some models are especially tailored towards the paranormal investigator by having backlights and covering the specific EMF fields most relevant to paranormal activity. Side Note - If there is a group of you it is not necessary for everyone to have an EMF meter, it's distracting having multiple meters registering fluctuations in vigil conditions.