Andrew, paranormaltours.com
There is a great company that we use called spectralelectronics. They manufacture EMF's that filter out electricity cables. When the EMF goes off it is definately not power lines. We've proved this a number of times when we have investigated in ruins where there are no cables (inc overhead). Spectral also manufacture a NID (Negative Ion Detector) & a Canum (Ultra-sonic listening device). Check them out.

Chris House, UKSPI
An Electromagnet is when a piece of soft iron becomes magnetic by passing electrons through it. You can make an electromagnet yourself using a 9V battery, iron nail, and a piece of wire. 1. Wind the copper wire around the nail in a spiral patter. 2. Attach the copperwire to the 9V battery. You can use an EMF reader to see if it works, or simply pick up some Iron filings with it. J, If you question was actually, what is an EMF, or EMF meter, the answer it below.

j from london
What actually is an electro-magnet i need to know for science

MIKE G.H.O.S.T
HELLO JORDAN, I GOT MINE FROM GHOSTMETER VERY CHEEP AND RELIABLE

Chris House, President UKSPI
Hi Jordan, try e-bay, they sell thousands! A good one sells for about £25-40

Jordan ,Ellicott City
Do any of you happen to know were I might find an EMF Meter?

Chris House, UKSPI, Southampton
AndyT, that is what I am saying, you have gone into a lengthy explanation of what I said. EMF is measuring the volume of electrons in an area. Both Electricity is just the movement of Electrons. AC being Alterneating Current, DC be Direct Current. An EMF baseline is the average concentration of electrons in an area. A true baseline test can only be carried out by plotting a graph of sensitive readings from an EMF meter to get the true average concentration. There is nearly always a cause for EMF, be it electricity cables or meteorological, EMF readings are significantly higher during Thunderstorms due to the concentration of static electricty in the atmosphere. This is implied by the name Electro (Electrons) Magnetic (Magnetism) Fluctuations.

AndyT- GHOST
Afraid your both wrong on the EMF meter. An AC EMF meter is used to measure the Gauss changes in the Electro Magnetic Field of whatever it is you are measuring. I could go into a lengthy technical explanation. What you are mainly looking for when looking at the paranormal aspect are anomalous changes in the baseline field, at different frequencies. Most EMF meters cannot pick up a static EMF fast enough for a fair reading. The AC EMF meter we are using probably isn't built to measure such a low frequency field, but if the derivative (acceleration), or velocity, of the moving field is fast enough, the field can create the appearance of being an AC field from the inductor's point of view, because a small current is produced in the inductor by a quickly moving static field, which gives the meter the illusion of an AC field. So, if you are holding the meter in one position, the reading should not change very much, this is called the "baseline" field. Any large changes (positive or negative) in that reading can be considered anomalous, and potentially from spirit activity.

Chris House - UKSPI.
An EMF reader measures Electromagnetic Fluctuations. EMF is caused by electrons in the atmosphere. Everything gives out a certain amount of EMF, including us. It is believed that ghosts draw electricity into themselves so that they can manifest. This creates an area which is full of electrons and is detected on an EMF reader. I hope that answers your question. Simon, all I can say is, how do you know they don't?

Mike G.H.O.S.T (Ghost Hunters Of Southampton Town
Hi Simon good question, sadly though the answer is only a collection of theories the first is the one I would lean towards it goes along the line of ghost only being a recording of past events (in most cases) and these types of haunting do tend to “run down” after time, less and less people see them the dinosaurs, as we know died out millions of years ago so perhaps they did have ghosts but they have just naturally warn away. The second is an issue of conception. We all know what a cat and a dog look like but with the dino’s we still don’t have a clear idea I.e. colour and texture ect so if ghost are partly based on information stored in our heads we cant see them because we don’t know what they look like. Hope I have helped.

Andrew House- UKSPI
Hello Jake, An EMF reader measures Electro magnetic fluctuations. However, its relevance is very much debated because everything has a electro magnetic field. It is believed that Spirits can affect these. However it is just a theory.

Jake, Salisbury
What exactly does an EMF meter measure, and why is it relevant?

Simon, Southampton
Why doesn't anyone ever see ghosts of dinosaurs? They see horses and dogs, after all.