I've learned over time the KII meter is absolutely useless as "proof" of paranormal activity. Not only does the meter not go off when things occur, but it often goes off when it has no paranormal stimulus, i.e. a regular room in a home not known to be haunted and when no one has asked for interaction with the other side. Under trial and error, I learned that the turning on of air-conditioners and heaters can set the damn thing off, even 15 feet away!
Here's what I compare it to: Someone tells me that their thermometer read "96.8 Fahrenheit." I now know that a temperature was recorded. Do I know if that was a temperature captured on a rectal reading? Oral? Tympanic? Ambient room temperature? The device is made to measure temperature, but the source of that temperature must be determined to know if you got a low human temperature or a toasty room temperature.
A KII meter simply tells you that there has been a spike in the electrical field, but the source of that electrical field is often times undetected. It doesn't mean we don't have a very natural source, i.e. an electrical device within the building, but I can guarantee you that you will find a correlation with the turning on and off of the air-conditioner system. Having the breakers turned off is a good start, but a surge can occur and be picked up by the device from sources you can't see or hear. To make the jump that because this device can periodically be set off means there's a ghostly interaction is a huge jump in explanatory style and one that is illogical. When you see J&G having a happy conversation with a ghost via KII, what you're not seeing on them are the battery packs for their mics, their walkies, cell phones, and other devices, not to mention the sound/film crew's devices.
If see electrical surges as proof of ghosts, there's not a damn thing I can do to convince you otherwise. We all have a different belief system based on how much we have to gain by that belief, whether it's passage to heaven, my way is righteous and others are wrong, or ghosts are amongst taking the form of measurable electrical fields.
The alternative is this interesting device that ignores the range of man-made electrical implements. Now, I'm intrigued!