From American Libraries:
Sonya Knisley, head of children’s services at Clark County (Ohio) Public Library (CCPL), has seen it happen over and over again. Someone walks into her location and applies for a library card—with one obvious aim. “As soon as they get their card, they immediately place a hold on a ghost-hunting kit,” Knisley says.
Like many libraries, CCPL has begun loaning out collections of specialized electronic items said to help seekers of the supernatural track down spirits. These kits usually consist of a backpack or carrying case filled with items such as a “spirit box,” which scans radio frequencies in hopes of encountering ghostly voices; an electromagnetic field (EMF) meter, on the theory that ghosts can manipulate EMFs; and a recorder for capturing electronic voice phenomena (EVP), aka messages from beyond the veil.