Haunted Fort Rock Cabin - Ghost Photo Session Dave Oester switched the Ghost Detector knob to the SUM position on the meter, which combines any changes in the electric field to any changes in the magnetic field, so that if either field increases or decreases, the needle will rise above zero. The tone can be silenced by turning the knob counterclockwise all the way.
Stationary readings tend to be the most reliable.
Some Ghost Detector owners position video cams, etc. to record overnight changes. Since construction materials, man-made electromagnetic devices, etc., generally do not interfere with readings, the Ghost Detector can be placed indoors and work equally well in detecting activity on the interior and exterior of the subject dwelling or building. If the magnetic field then becomes stable for more than about five seconds, the tone will stop and the needle will return to zero. The meter will remain at rest until the field changes again. If the field changes by the threshold amount, the tone will sound at a low pitch.