EMF Meter Phone Apps – Do They Work and Indicate Dangerous Conditions and Health Risks?

by ScanTech Technical Consulting - CIH, CSP, BSEE, CHMM, CHP (Pending) · Published November 30, 2013 · Updated April 23, 2024

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EMF Meter App for Cell Phones

I was recently contacted by a commercial client who was concerned about purchasing office space in McKinney due to a number of factors:

1) The close proximity of some imposing high voltage powerlines directly outside of his office

2) Recent inexplicable computer equipment failures in the office

3) They downloaded an EMF app onto their cell phone that measures magnetic fields.

Q. So does this app really work?

EMF App DC Magnetic Field Reading (not 60 Hz AC Powerline frequency)

DC Magnetic Field EMF Reading: NOT the same as 60 Hz AC Power Line frequencies

A. Yes, but NOT in the manner that you think. It works as far as measuring the NATURAL DC magnetic field of the Earth which varies according to locale and the proximity of ferromagnetic building material. But DC means there is no frequency or fluctuation in the field; it is by definition 0 Hertz or 0 cycles per second as opposed to the North American power grid frequency of 60 Hz (Hertz) or the European frequency of 50 Hz.

What is the difference?

Quite a bit.

There is very little evidence that DC magnetic fields are harmful in any way (except higher intensity fields than Earth normal (~550 mG DC) to those with certain biomedical implants such as pacemakers, ICDs, implantable defibrillators, etc.) and in fact there are patents on medical devices which use low level DC fields to speed the healing of broken bones.

But look at the overall reading above showing 834 milliGauss (mG) with the bar graph registering ominously in the red. And speaking of which, the “Green – Yellow – Red” color coding scheme is something I object to in EMF / RF testing instrumentation as it is completely arbitrary from a technical standpoint and induces needless fear-mongering with regard to actual safety levels. It is done partly as a marketing feature to make it look cool, but also as an attempt to give some kind of intuitive user knowledge about the EMFs in the environment, but in fact instills false confidence / alarm and infers incorrect information.

While I can give a brief overview of bio-electromagnetics to my clients while consulting, diving into the details is an incredibly complex subject that even a B.S. in Electrical Engineering does not fully prepare you for. A biomedical knowledge of human and cellular physiology (thus, my continuing education and credentials as a biomedical engineer) plus at least some understanding of disease epidemiology and probability / statistics is a must which makes this a truly interdisciplinary field that few understand well.

While the Earth’s magnetic field is typically around 500 – 600 mG, this can be either concentrated or attenuated significantly when inside of the frame of a steel building. What can potentially scare people with this app is that they read about Swiss safety limits of 10 mG, 2.5 mG or even 1 mG and then they assume this reading means they are in some sort of danger. I can guarantee that this meter does not measure anything having to do with biological health or safety with respect to AC power lines.

The reason for having DC magnetometers built into a smart phone is so that it can relate relative positions of the phone (such as when you turn it on it’s side) with respect to the Earth’s magnetic field and then respond accordingly. Also, the Green Yellow Red convention is a holdover / carry over feature from the realm of ghost hunting and paranormal investigation as these apps are used on field hunts. Bear in mind that these investigations typically take place at night when it is DARK and often the meter is kept in sight of a camera so that if some form of anomalous event takes place, it can be potentially corroborated by the reading on the meter with the bar graph style color fluctuations being an added visual indication of some kind of change.

Again, the Green Yellow Red color convention has absolutely no relevance or meaning to any particular health hazard, etc. it is a completely arbitrary set of value ranges that is solely dependent on the app developer. It is a cool app to play with and I have it on my Android phone, (I’ve never owned an Apple phone, so I have no idea what kind of iOS Apple EMF app exists) but it is not something I would use for a professional EMF inspection, nor would I use it to advise a client on the health, safety or risk conditions of their environment.

For more information on what EMF fields are considered to be “high” please see this recent post:

Is EMF Dangerous?

https://www.icnirp.org/en/frequencies/

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ScanTech Technical Consulting is owned and operated by Joel-Anthony Gray who has over 22 years of experience as an EMF consultant, EMI troubleshooting expert and nuclear radiation testing consultant for a variety of commercial and industrial customers. While there is currently no such thing as a Certified EMF Consultant as far as the United States industrial and scientific community at large is concerned, what ScanTech offers is extensive education, experience and multiple certifications in non-ionizing radiation, industrial safety and hygiene. (listed here EMF Credentials) He holds numerous degrees and certifications which qualify him for this level of expertise. Call 214.912.4691

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