Why use EMF meters at all?
EMF meters are designed to measure mains-frequency magnetic and electric fields in buildings to see if they exceed certain levels*(see also here). It is, therefore, difficult to see why such a meter should detect ghosts, given that it is unlikely they are mains powered! It is likely that the popularity of EMF meters in ghost research arose simply from the fact that they are easily and cheaply available. When used to detect electromagnetic pollution, EMF meters produce perfectly useful readings. It is easy to measure a continuous high field produced by nearby electrical equipment, for instance. However, ghost researchers look for unusually high variability and/or ‘spikes’ in areas of low readings, mostly away from electrical equipment. To do this, they need to understand how EMF meters behave away from the application for which they were designed. This behaviour tends to vary between models. What causes EMF readings? When looking at low level EM fields, there are many possible sources o
