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Trifield natural em meter (ghost hunting)
This unit is perfect for ghost hunting, it is in very good cosmetic and working condition.
The TriField Natural EM Meter detects changes in extremely weak static (or natural") electric and magnetic fields. It signals with both a tone and the movement of a needle-type gauge if either the electric or magnetic field changes from previous levels. A radio and microwave detector is also included, which reads radio power directly if any transmitters are nearby. Since man-made AC electric and magnetic fields are very common and could interfere with readings of static fields, the meter has been designed to ignore the AC fields of power lines, appliances, etc.
This meter was 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 (which results in rapid changes of up to 10% in the Earth's magnetic field), as well as the electrical activity of ordinary thunder storms. 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 Natural EM Meter 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. Since construction materials generally do not block magnetic fields, the meter can be placed indoors and work equally well. The built-in tone allows its use in the dark.
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 a threshold amount, the tone will come on at at lower pitch. If the amount of change is large, 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 l0'xl0'xl0' 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 3 V/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 Natural EM Meter. In fact, the meter can be used as a motion-activated intruder alarm. It is so sensitive that it can detect the presence of a person through a wall. Though it is not foolproof in this capacity, (sometimes a person will carry NO electric charge and thus be "invisible" to the meter), its sensitivity is of interest to researchers in the field of parapsychology, especially "ghost hunters". Every type of detectable physical manifestation requires a certain amount of energy. For example, "moving air" requires the expenditure of a small amount of energy to get the air to move initially.
