G.H.O.S.T.S. of Raleigh utilizes the following very basic instruments:  

Motion detectors, laser grid pen, T.O.P.S. (Trigger Object Proximity Sensor), EMF meters, Olympus WS-311M digital voice recorders, Sony ICD-SX750 digital voice recorder, flip video, Nikon D3000 digital camera, Fujifilm FinePix S4300 digital camera, Sony digital DCR-SX63 camcorder, infrared laser thermometers, and infrared video camera.  

What's the most important piece of equipment?  The investigator.