Adrian Lee, ghost hunter and founder of the International Paranormal Society, spoke to a sold out audience at the State Fair ...

DIY kits for junior theremins cost less than $20, but ghost-hunting supply stores charge $120 to $190 for models marketed as REM pods. They’re also overly sensitive and unpredictable.

If you join one of the hundreds of ghost-hunting excursions offered around the country, you’re likely to encounter a slew of gadgets: EMF meters, REM pods, and spirit boxes galore.