this is a brand NEW Alphalab Trifield Meter Measures AC Electric/AC Magnetic Field Strength, Gauss Meter. A perfect item for setting up your own ghost hunting expedition. (This Trifield Meter is the same model used by Most Haunted on the Travel channel)
MFG suggested retail $159.00
SPECIFICATIONS
Depending on where the knob is set, the meter detects either frequency- weighted magnetic fields (two separate scales), or frequency-weighted electric fields in the ELF and VLF range. It has significant sensitivity at 100,000 Hz, well past the 17,000 Hz horizontal scan of video displays. The radio/microwave setting can detect up to three billion Hz (3 GHz), which lets you gauge radio- wave power, CB and cellular phone equipment, and many types of radars.
The TriField meter is the only one which combines magnetic, electric, and radio/microwave detectors in one package, so that the entire nonionizing electromagnetic spectrum is covered. The magnetic section of the TriField meter has three field-detecting coils pointing in the X, Y, and Z directions. A circuit amplifies these signals and gives them the proper frequency-weighting (sensitivity increases linearly from 30 Hz to 500 Hz, but with some residual sensitivity up to 100 MHz). A unique network combines the three coil outputs nonlinearly to approximate a true magnitude. The meter is sensitive from 0.2 to 100 milligauss full scale at 60 Hz (or 0.1 to 50 milligauss full scale at 120 Hz, etc.) with a resolution of 0.2 milligauss in the sensitive range. Accuracy is +/-20% at mid-range. A version with flat frequency response (instead of linear sensitivity increase) is also available for the same price.
This was designed as a more general electromagnetic measurement tool. It detects electric fields from power line frequencies up through 2.5 GHz. This fills in the gap from 100 KHz to 50 MHz for which there are little or no known health effects. For that reason, those frequencies are not detected by the standard TriField Meter. The Broadband detects magnetic fields up through 100 KHz.
The AC magnetic section is identical to that of the standard TriField Meter and has several uses. It can detect which of several wires or transformers is carrying current, and help determine appropriate placement of magnetically sensitive equipment. It can also help to reduce personal exposure to fields and thus minimize possible health effects. Most users prefer a magnetic section which is frequency-weighted, and calibrated at 60 Hz. However, a flat frequency response version (50 Hz to 500 Hz) is also available for the AC magnetic section. This is the same price as the regular frequency-weighted version (which has sensitivity proportional to frequency from 50 Hz to 500 Hz.)
The AC electric section is also identical to that of the standard TriField Meter and can be used to determine whether an AC line is hot or neutral, even through a wall. It can easily detect by proximity which side of a wall outlet or which wire of an extension cord is hot. It can also detect improper grounding, as well as the extensive electric fields from video monitors and fluorescent lights. Besides indicating a shock hazard, an AC electric field might have direct health effects, and this meter can be used to minimize exposure.
The radio/microwave section detects vertical electric fields parallel to the long axis of the meter. Range is 10V/m to 1 KV/m (0.026 mW/cm2 to 260 mW/cm2) and is frequency-flat from 100 KHz to 2.5 GHz. Accuracy is +/-30%. It is used to detect ON-AIR status of transmitters (or to detect concealed transmitters), to check microwave ovens or other microwave equipment for leakage, and to look for RFI sources.
For radio waves, magnetic field strength is proportional to electric field strength. Therefore only electric or magnetic need be measured. In a radio wave, one milligauss corresponds to 30 volts per meter, which are the RMS magnetic and electric fields for a power density of 0.24 milliwatt/cm2. The power density increases as the square of the field strength, and the field strength decreases as the inverse distance from the transmitting antenna.
The Broadband Meter comes with a one-year warranty and a 9-volt transistor battery included. This type of battery lasts about 10 hours (total measurement time). When the BATTERY TEST reads low, the battery can be replaced with any rectangular 9 volt transistor or alkaline (which lasts about 50 hours) type. This meter is manufactured in the USA.