Yep! A machine to detect ghosts have been invented by a Japanese
company and is available in the US for $185. It purportedly works by
beeping and flashing red lights in response to unusual magnetic
waves. It comes attached to USB memory storage device, which holds
data such as documents, digital photos and MP3 music files and plugs
into a a computer's USB port. It is recommended for spooky late
nights alone at your computer, and for those curious about finding
out if their sudden chills represent a supernatural visitor
computer's USB port. Its memory ranges from 128-512 megabytes.

Question is why would anybody need a MACHINE to detect ghosts???,
when it is possible for most anybody to detect them? If they know
what to look for, that is. Some of the signs of a haunting are so
subtle that people will pass it off as just some odd, insignificant
feeling.

For example, if you suddenly, 'for no apparent reason' get
goosebumps, the hair on your arms are standing, yet you don't see
anything....

That ladies and gentlemen means a prescence is in the vicinity.

http://www.spottinghauntedhouses.com/ghostletters.html