The equipment is designed to satisfy the need to measure and / or detect EMF's (electromagnetic fields), RF - Radio/Microwave Fields, Electric Fields, extremely weak static (or "natural") electric and magnetic fields, negative air ions (emitted by air cleaners, negative ion generators, waterfalls), positive air ions, radon, etc..

http://www.deltatech.com/enviro/emfx.html

Theses meters were never designed to detect ghosts or any paranormal anomalies.

Some paranormal investigators say the ghost or spirit radiate electromagnetic properties and can be picked up on an electronic meters, however, on all our investigations we have used the EMF meters and have never picked up spirit on them, although we have had a few good strong readings, but upon investigation, it has always been an explainable source.

We use the meters to eliminate man made or natural radiation's, as some people can feel (pickup) the magnetic radiation's and possibly lead them to believe they have sensed a ghost, spirit or other supernatural experience.

On any investigation, you need to do a base test inside and outside, to detect any potential interference i.e. power cables, phone lines, even metal trimming's (gutters, window frames etc) as these can sometimes become antenna's for any electromagnetic radiation (mobile phones, fluorescent lights, storm's) http://www.vlf.it/

The way to use all these meters is to switch the unit, place it on a surface and let the readings settle, then walk away. Monitor the meter from a comfortable distance as your body could and would interfere with the readings.

Also anyone with a mobile phone or a camera walking by, will set the meter off, also traffic outside has the same effect, so be very careful where you place the meter on set up.