Aside from a camera, the EMF meter is the most basic tool for any ghost hunter.When ghostly activity takes place, electromagnetic disturbances occur in the environment. The Ghost Meter allows you to detect these disturbances. Take a photo when the meter fluctuates and you may be able to capture a picture of a ghost(often seen as a strange orb). We tested the meter in our own warehouse - located in an old factory building - and found some scarily suspicious readings. Handheld meter requires one 9V battery (not included). PREORDER TODAY!