EMF Meters

EMF meters, used to indicate the overall intensity of a range of  EMFs, are available with a wide range of sensitivities, frequency responses and features. For home or office use, simple broadband meters are often sufficient for an initial survey. Generally two different types of meters are required; an EMF meter for ELF fields and a broadband meter for RF fields, although these are sometimes combined into one instrument.

The EMF meter is used to measure the magnetic fields associated with ELFs (e.g. powerline frequencies) whilst the RF broadband meter should measure the voltage gradient or power density of RF fields The RF meter should be capable of measuring the pulsed RF power produced by mobile phones and masts, cordless DECT phones and  wireless networks in addition to the continuous power of less complex RF sources such as radio and TV transmitters. Inexpensive examples of both types of meter, or a combined meter,  may be purchased on this website. 

For more accurate extensive surveys, more sophisticated instruments are required. For instance, simple meters generally provide only a one-dimensional field reading (unless multiple readings and some complex maths are used) whereas triaxial meters provide a true three-dimensional field measurement. Meters with a greater frequency range may be required to measure less-common EMFs.  Other instruments such as spectrum analyzers and directional antennae are required if the source of an EMF is to be localized. Such instruments are used by EMF UK in their  surveys

The EMF meter shown below is the ELF-ZONE indicator. It is extremely easy to use and provides an indication based on precautionary limits  for long term chronic exposure to extremely low frequency EMFs from powerlines, faulty wiring and domestic appliances. It does not however measure EMFs from radio frequency sources such as mobile phone masts and microwave ovens. A guide to carrying out an EMF survey is included.

Specifications:-

Indicators:

    SAFE  0 to 2.5 milli Gauss

    CAUTION  2.5 to 7milli Gauss

    DANGER 8 milli Gauss or higher

(Limits may also be expressed in micro Teslas. One milli Gauss is equivalent to 0.1 micro Tesla).

Specifications:-

Frequency response    300MHz to 3GHz

The ED15SA RF meter is pictured below. It will measure broadband power density over the range 100MHz to 3GHz - a range which includes all the common RF frequencies found in the home, such as mobile phones and their masts, cordless DECT phones and wireless networks. Additionally it includes a spectrum analyzer function over the frequency range used by wireless networks, video senders, wireless CCTV cameras  and microwave ovens. This 2.4GHz band is of particular interest as it is easily absorbed by the human body.  The spectrum analyzer is also useful for identifying sources of interference. This meter does not however measure sources of ELF fields from power lines and household appliances. Instructions for use are included.

Frequency response: 100MHz to 3GHz (power meter),
2.4GHz-2.485GHz (spectrum analyzer)

The ED25G ELF/RF broadband meter is shown below. It is essentially a combination of two meters - an ELF meter and a RF broadband meter .In ELF mode it will measure extremely low frequency EMFs from powerlines, faulty wiring and from domestic appliances. In RF mode it will measure broadband power density over the range 100MHz to 3GHz - a range which includes all the common frequencies found in the home, such as mobile phones and their masts, cordless DECT phones and wireless networks.  The meter is compact in size and extremely easy to use with only three buttons - on/off, mode and hold. A backlight can be switched on or off as required. Instructions for use are included. 

Frequency response: 100MHz to 3GHz (RF power meter),

50Hz to 10KHz (ELF Gaussmeter)

Specifications:-

Frequency response 16Hz to 2,000Hz
           

Sensitivity:
magnetic  1nT to 2,000nT (0.01mG to  20mG)
electric  1V/m to 2,000V/m

(Please see here for full specifications)

Specifications:-

Frequency response 5Hz to 100,000Hz


Sensitivity:
magnetic  1nT to  2,000nT (0.01mG to 20mG)
electric 1V/m to 2,000V/m

(Please see here for full specifications)