The K-II meter is used by ghost hunters to find indications of paranormal activity by looking for sudden erratic readings (spikes) of the lights . A man-made Electromagnetic Field (EMF) creates a steady reading while the spirit worlds energy is believed to be what creates the impulse readings on the K-II meter. Researchers using the K-II meter have been able to do actual communication sessions with what is believed to be ghosts. The spirit is simply instructed to light up the lights on the meter in response to specific questions. For example, the ghost can be asked to respond with spiking up the lights of the K-II meter once for a no answer to a question and to light up the lights of the meter twice for a yes answer to a question.