The Trifield Natural EMF meter:

 
Among the instruments utilized by paranormal and parapsychological
researchers in segments of SIGHTINGS, PSI FACTOR: CHRONICLES OF THE
PARANORMAL, STRANGE UNIVERSE, 48 HOURS ("Putting Paranormal to the Test"), NEXTSTEP (Discovery Channel program), the Ghost Detector
(Trifield Natural EMF Meter) was invented, designed, engineered and
produced by Dr. William B. Lee Phd (Physics) in late 1995.
 

Recognized for it's utility in paranormal and parapsychological
research, the device detects changes in extremely weak static (or
"natural") electric and magnetic fields. A compact, 9-volt battery
operated, hand held unit (see photo) the meter is simple to use, just
turn the knob to select magnetic, sum, electric, radio / microwave
(handy to determine relative intensities of cell telephone fields) or
battery test (check this position prior to heading out into the field),
to assure the battery has enough juice for your planned foray.

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Co-Directors Anne Palagruto and Dave Juliano employ the Ghost
Detector on  many of their investigations. C L I C K  H E R E  to
view photos taken by South Jersey Ghost Researchwith the help of
the Trifield Natural EMF Detector.

The investigators set 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 volume (tone threshold) of the
built-in alarm side knob, on the right side of the device, can be
adjusted and will signal a change if the gauge needle deflection is
significant. The tone can be silenced by turning the knob
counterclockwise all the way.

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Paranormal & Parapsychological Researchers find the Ghost Detector
simplifies detection of entities or phenomena which disrupt existing
fields, since the meter is engineered to ignore man-made powerlines and
appliances, etc., eliminating a plethora of false "positives". This
feature is extremely uncommon in instruments priced under $2,000!
 

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.
 

The built-in tone allows the Ghost Detector to be used in the dark to
detect rapid changes in the magnetic or electric fields facilitating
twilight and evening, field scanning (including dark moon or "pitch
black" conditions).
 

The meter is sensitive to changes of as little as 0.5% of the strength
of the Earth's magnetic field, and the tone will sound whether the field
increases or decreases. 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. The threshold level, or "squelch", of the tone is adjustable. The
user determines the amount of change in the magnetic field (within a 0.5
second interval) required to sound the tone. If the field changes by the
threshold amount, the tone will sound at a low pitch. If the amount of
change is larger, the pitch of the tone will be higher.
 

When the dial is set to electric, the meter is sensitive to electric
fields as weak as 3 V/m (volts per meter). To illustrate just how feeble
a field this is, a 10'x10'x10' room filled with a field of this strength
has a total amount of energy equivalent to that required to lift a
single grain of table salt 1/50th of an inch. Indoors, electric fields
typically fluctuate 1 or 2 V/m. By setting the minimum sensitivity to
change at 3V/m, we have designed the meter to disregard this "background
noise". Human beings and animals usually emit an electric field which is
easily detectable using the Ghost Detector. In fact, the instrument can
be utilized as a motion-activated intruder alarm. This extreme
sensitivity allows the meter to detect the presence of a person through
a wall. Though not foolproof in this capacity (occasionally a person
will carry no electric charge and thus be "invisible" to the meter), the
extraordinary sensitivity is of interest to researchers in the field of
parapsychology, especially "ghost hunters".
 

The instrument was originally designed to satisfy the need for natural
field measurements in specialized research areas. It can detect
"geomagnetic storms", caused by unusual solar activity interacting with
the ionosphere resulting in rapid changes of up to 10% in the Earth's
magnetic field, as well as the electrical activity of ordinary
thunderstorms. Ball lightning should, in theory, be associated with a
strong magnetic field and magnetization of metal has been reported with
some UFO sightings. When set on "magnetic", the device will signal the
movement of any strong magnetic source in the sky, even if the sky is
cloudy or the source dips behind a hill.
 

The Ghost Detector / Trifield Natural EMF Meter is also called Model 1
and is the most useful of all Trifield meters for paranormal /
parapsychological field work. An alkaline battery will last for
approximately 50 hours of use.
 

The radio / microwave setting is primarily useful for surveillance
device detection (industrial "bugs", etc.) as well as microwave oven
leaks, cellular phone radiation (enabling the user to select a cell
phone with a lower RF / Microwave field emission),  etc.
 

Another version of the Trifield Natural EMF Meter was produced, the
Model 2 , and equipped with a probe which is primarily useful for
detecting extremely high altitude UFO's., and is available at a higher
cost.