While the majority of paranormal survey equipment is re-purposed environmental survey technology there are many devices that are also prototypes or modified to suite ghost hunting neeeds.
Archos 5IMT
Magniitech 263
A highly sensitive tri-axis EMF meter that is used to establish site RMS and identify peak EMF axis.
Lutron EMF Tester
Classic 'Ghost Hunters' EMF meter featuring a digital display for more accurate measurements.