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Trifield Meter
Qty :
The original TriField ® Meter combines all the features needed for fast, accurate measurements of electromagnetic fields.

EMR Trifield Meter

Trifield Meter & Watt's the Buzz?
Qty :
The original TriField ® Meter combines all the features needed for fast, accurate measurements of electromagnetic fields.

Watt's the Buzz? - This easy-to-read layman’s guide explains everything you need to know about electromagnetic radiation in your daily life, including how you can reduce your exposure at home and at work.

EMR Trifield Meter

AC gaussmeter, electric field meter, RF field strength meter combined in one electromagnetic instrument.

The TriField Meter (and BroadBand TriField Meter)
An excellent tool for electricians or those curious about EMF fields.

This meter reads AC fields, such as from power lines.

The original TriField ® Meter combines all the features needed for fast, accurate measurements of electromagnetic fields. It measures both electric fields and magnetic fields, and is properly scaled to indicate the full magnitude of currents produced by each type of field inside a conductive body. As a result, it "sees" much more than any other electromagnetic pollution meter.

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.

This 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. In addition, the magnetic setting and the electric setting measure true magnitude, a feature found elsewhere only in more expensive meters. If you hold the meter in the center of a room and tip it to various angles, the magnetic reading will stay approximately the same regardless of which way you tip or rotate it. The electric reading is similar, although the presence of your body alters the actual electric field, so readings will vary more. The radio/microwave setting reads the full power of radiowaves when the meter is pointed toward the source.

Surprisingly, the standard TriField Meter is one of the least expensive meters available. The few other meters below $300 read only low-frequency magnetic fields and only in one direction (not true magnitude). 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.

The TriField 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. TriField is a registered trademark of W.B. Lee.