The small, Syracuse, New York-based company K-II Enterprises makes a number of handheld electronic devices—including the Dog Dazer (a supposedly safe, humane device that deters aggressive dogs with high-pitched radio signals)—but it is best known for the Safe Range EMF. The size of a television remote, the Safe Range EMF detects electromagnetic fields, or EMF, measuring them with a bright LED array that moves from green to red depending on their strength. Designed to locate potentially harmful EMF radiation from nearby power lines or household appliances, the Safe Range has become popular for another use: detecting ghosts.
Since its appearance in the show Ghost Hunters, where the ghost hunter Grant Wilson claimed that it has been “specially calibrated for paranormal investigators,” the Safe Range (usually referred to as a K-II meter) has become ubiquitous among those looking for spirits. Search for it on Amazon, and many listings will refer to it as a “ghost meter,” an indispensable tool in the ghost hunter’s arsenal. It isn’t alone among EMF meters: Of the best-selling EMF meters on Amazon, two out of the top three are explicitly marketed as ghost meters.
Scanning the various product descriptions and reviews, though, what becomes clear is that the K-II Safe Range is a relatively unreliable electromagnetic field meter. It operates only on one axis (you have to wave it around to get a proper reading), and it’s unshielded, meaning that it can be set off by a cell phone, a two-way radio, or virtually any kind of electronic device that occasionally gives off electromagnetic waves. The reviewer Kenny Biddle found he could set it off with, among other things, a computer mouse and a camera battery pack.