Here are a few tools that we use to
investigate the paranormal:
Electromagnetic Field Meters --
detects fluctuations in the EMF.  
There are a lot of different things
can affect this equipment, but it is
theorized that entities manifest
themselves via the EMF.
Infrared Digital Thermometer--
used to detect thermal variations
which some believe can indicate
the presence of a ghost.
Digital Voice recorders--
Records EVP sessions.  
EVP--electronic voice
phenomenon can be a good
indication of the presence of
ghosts or spirits.
Wireless Audio Microphones.   
Used to monitor locations and
records audio to the laptop for
EVP analysis
Motion Detectors -- Allows us to
secure a site, and potentially
tracks the movement of entities.
4 channel DVR system
w/monitor
-- Records and displays
video from our Infrared Video
Cameras
Infrared Video Cameras -- It
helps us see in the dark and also
detects things that our eyes can't
see.
Computers -- We use Gateway
computers, exclusively.  We have 3
Gateway laptops and 1 Gateway
Desktop.  We use them for
logging, analyzing, and storing
data from investigations.
DVD Camcorder-- used to record
areas of concern.  It allows us to
record hours of data to go over
later.
Digital and 35 MM Cameras --
Provides photographic evidence.  
Also documents the investigation
site.  Note:  This group does not
believe that orbs are evidence of a
haunting.
Wireless Weather Station--
Tracks the indoor temperature and
humidity changes.
Green Laser Light Grid-- It is
believed that you can see entities
move through the grid.
Audacity -- We use Audacity
software to analyze all our audio
from our investigations.  Click on
the headphones to get your own
Free download!