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Trifield Electromagnetic Meter 3-Axis EMF Detector Model 100XE
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Trifield Electromagnetic Meter 3-Axis EMF Detector Model 100XE

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Item details
SKU: Trifield-100XE

Stock: Out of stock

Brand: AlphaLab Inc
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Trifield ® Meter Model 100XE
Manufactured in the USA by AlphaLab, Inc.
Electromagnetic pollution meter
(magnetic, electric, microwave fields)

Trifield ® Meter measures all three types of electromagnetic field: AC magnetic field, AC electric field (40 Hz – 100 KHz), and radio (including microwaves). The magnetic and electric detectors are 3-axis, making the meter easier to use than comparable 1-axis meter.

The Radio/Microwave section of this meter reads most modern radio sources (50 MHz - 3 GHz).


  • 50 Hz: Calibrated for European power frequency (and certain other regions).
  • It operates on a standard 9-volt battery.

Product Description:

The Trifield ® Meter is a gaussmeter, electric field meter, radio field strength meter in a single until. When measuring electromagnetic fields (EMF’s), the primary concern is usually magnetic fields, which can be tricky to measure. If a less sophisticated 1-axis gaussmeter is used, a reading of zero could result even where the field is strong. A 1-axis meter must be oriented correctly to measure the field (which is a vector). The 3-axis Trifield Meter solves that problem by measuring the true strength of the field regardless of which way it is oriented. Therefore, the Trifield Meter can be scanned rapidly across an area without having to stop at each point to search for the orientation that gives a maximum reading. Another section of the meter detects AC electric fields, which can exist independently of AC magnetic field. The third section detects radio/microwave, such as from a leaky microwave oven.


  • Detects the three type of electromagnetic pollution: AC magnetic fields, AC electric fields, and radio/microwaves.
  • AC magnetic and electric fields are 3-axis, allowing quick accurate readings regardless of meter orientation.
  • Two magnetic ranges cover 0.2-100 milligauss.
  • This is sufficiently sensitive to detect the background field almost anywhere (except for from civilization), while measuring up to very strong AC fields.
  • Electric range covers 5-1000 V/m (or .5-100 kV/m with original version of the Trifield Meter)
  • Radio/microwave covers 10 to 1000 microwatts/square cm which includes the maximum permissible public exposure levels in all countries.
  • Operates about 40 hours on replaceable standard 9V battery, has a low battery indicator.
  • Analog (needle-type) display has very fast response time compared to digital. (However, AlphaLab also manufactures digital meters).


  • Measures AC (artificial) magnetic fields rapidly. (Does not measure DC of static fields, such as the Earth Field. Click here for other magnetic meters).
  • Measures AC electric fields rapidly, such as from overhead power lines or improperly grounded equipment. Can locate wiring in walls (using the 100XE version).
  • Measures major RF/microwave sources such as leakage from microwave ovens, or the field near cell towers. (Note that wireless internet transmitters and individual cell phone are designed to emit very little power and usually are well below international RF exposure threshold. Consequently, the Trifield Meter will only detect these it very near the source.)


Trifield® Meter Model 100XE

  • AC Magnetic Fields: (3-axis; shows true magnitude)
  • Frequency Range: 40 Hz – 100 KHz (see frequency weighting)
  • Accuracy @ 50 Hz: +/- 20% of reading
  • Range/Resolution @ 50 Hz: 100 milligauss / 0.2 milligauss
  • Standard Version Frequency Weighting: *Sensitivity is proportional to frequency from 40 Hz to 500 Hz; flat from 500 Hz to 2000 Hz*Sensitivity is inversely proportional to frequency from 2K Hz to 100K Hz
  • Flat Frequency Version: +/- 20% from 50 Hz to 500 Hz; inverse frequency above 500 Hz
  • AC Electric Fields: (3-axis; however, note that E-field is affected by the body position)
  • Frequency Range: 40 Hz – 100 K Hz (see frequency weighting)
  • Accuracy @ 50 Hz: +/- 30% of reading
  • Range/Resolution: 1000 V/m / 5 V/m (Original Version: 100 KV/m / 0.5 KV/m)
  • Frequency Weighting: Same as magnetic (above).
  • Frequency Range: 50 MHz – 3000 MHz (3 GHz)
  • Radio Microwave: 1 Axis (detect E field)
  • Range/Resolution: 1 mW/cm2 / 0.01 mW/cm2
  • Accuracy: ½ x to 2 x of reading
  • Meter Size: 5.0 x 2.6 x 2.4 in (129 x 67 x 62 mm)
  • Weight: 8 oz
  • Battery: 9 volt alkaline (~ 40 hour life) / "Low Battery" indicator

Using The Trifield Meter:

A knob on the front has six positions: OFF, BATTERY TEST, two MAGNETIC field sensitivities (0.5-100 milligauss at 50 Hz, and 0.2-3 milligauss at 50 Hz, the second sensitivity to measure weak fields more accurately), ELECTRIC field and RADIO/MICROWAVE power density. The meter face is analog (needle type). A needle reading of one-third of full scale corresponds to either 3 milligauss (or 0.6 milligauss) @ 50 Hz, 3 kilovolts/meter @ 50 Hz, or 0.04 mW/cm2 respectively in the magnetic, electric, and radio/microwave field settings. Average magnetic field strength in North American homes and offices is 1-3 milligauss, so the meter is labeled "HIGH" above these levels.

Magnetic Field Detection:

In most homes or offices, some areas are "hot" spots with readings in the HIGH range. Most often, this is caused by magnetic fields, which come largely from unpaired internal wiring. (Contrary to popular belief, power transmission lines and transformers do not generally contribute as much magnetic field as does internal wiring.) Other magnetic sources include video displays, motorized clocks and other equipment, electric blankets and heaters, fluorescent lights and light dimmers, and the transformers that are inside consumer devices. Much of the total field strength is from frequencies that are harmonics or multiples of 50 Hz (100 Hz, 150 Hz, etc.) and 17,000 Hz of video displays. Cars (especially near the front floorboard of electronic ignition cars) and motorcycles have fairly strong fields that are at frequencies higher than 50 Hz. Magnetic field is difficult to shield, but sheet steel is somewhat effective.

Electric Field Detection:

A few areas in most homes read HIGH in the electric field setting. These include areas near improperly grounded equipment, the front of video screens, and fluorescent lights. Most of these fields can be easily shielded using a grounded metal screen or foil; VDT screens of this type are readily available. You can greatly reduce the strength of an electric field just by placing your hand in front of the source. This effect can be seen using a TriField meter.>Microwave Detection:Occasionally, certain areas read HIGH in the radio/microwave setting. These include door seals around microwave ovens, and cellular phones (but not regular radio phones, which are very low-power). Radio/microwaves can be shielded in the same way as electric fields, although the lower frequency radio waves are not shielded by your hand as easily as microwaves are. (Metal screens will shield both.) In the United States, radars and FM transmitters can legally expose residents to moderately high power levels (as high as 10 mW/cm2 briefly or .57 mW/cm2 near cellular towers), but such exposure is not common.

Reducing Field Exposure:

Some equipment is sensitive to magnetic fields (ie, a high resolution color monitor may not function properly above 30 milligauss). By seeing "hot" spots in your home and office, you can move equipment or furniture to reduce exposure. If a room has a "hot" spot, fields are generally much weaker elsewhere in that same room.

One Year Limited Manufacturer Warranty