The following chart lists an overview of what is deemed safe for high frequency radiation and electro-magnetic Fields…
WATCH THIS VIDEO FOR MORE ON THE DANGERS OF EMF:
SOME OF THE REVIEWS FOR THIS PRODUCT:
I was a radio communication tech for 35+ years so I’m pretty picky on how test equipment should work.
But it seems to work as advertises. I have a state police 800 meg (30 channels trunked) radio tower with microwave dishes all over it in my neighborhood. . This unit told me my home was not in any strong RF fields from that tower. (My friend who lives much closer lives in a 24/7 RF bath that is truly scary)
This unit did quite well at picking up power line EMF, the biggest problem in my home. The Dell computer tower under my desk (pretty much radiating EMF between my legs) was a huge offender and just had to be moved. The computer in my bedroom is a better Dell and had nearly zero radiation. My WIFI was well placed but if your WIFI sits close to you where you sit, move the dam thing so it is at least several yards away (around the WIFI box the RF field is quite strong). (low quality LED and more industrial home/office florescent lights may surprise you and how much EMF and RF they put out)
I absolutely recommend this product.
SAMPLE EMF MEASUREMENTS:
There is no definitive consensus nor clear epidemiological evidence yet as to how much milligauss (mG) for extended periods could be harmful (within reasonable home/office real world levels). However, there is a consensus from studies that staying under 1mG-4mG would be a good defensive strategy in case 20-40 years from now longer term studies (think smoking, etc.) start showing stronger causal relationships. Most folks who care about this aim for under 2mG, preferably under 1mG, especially where pacemakers can be involved.
Here are some sample readings of LOW frequency AC MAGNETIC field EMF (Note: not electric field):
(1) Alarm Clock
(2) Microwave Oven #1 (Home)
Towards decent seal:
Towards questionable seal:
(3) Microwave Oven #2 (Office)
(4) CRT Television (20″ Sony WEGA)
Down the middle:
Sides/Edges in the middle vertically:
(5) 2012 LED Television
(6) Dehumidifier (Large 70pt. Frigidaire)
Around most of it:
On one side we get:
(7) High-End Modern Very Large Copy Machine
Not much mG at all
(8) Office Ceiling Fluorescent Bulbs
(9) Uncovered CFL Bulb
(10) Box Fan
6″ 6mG (from center motor only)
(11) Standing child’s fan
(12) Washer (Clothes)
Bottom – Usually:
Bottom – while Spinning:
(13) Dryer (Clothes)
Head height 0.5mG
EMF METER SHOPPING GENERAL NOTES:
EMF FROM LOWER FREQUENCIES:
At LOWER FREQUENCIES we can measure magnetic fields (in milligauss (mG) or microteslas (uT)), and higher end units also measure electric fields (V/m,W/cm2, etc.). Unlike higher frequencies where magnetic and electric fields are strongly coupled together, at lower frequencies you measure them separately.
As noted elsewhere in the review, for biological exposure it is suggested to play defense and keep prolonged exposure from lower frequency Magnetic Fields to under 1-4 mG (preferably under 1-2 mG) but there is no definitive consensus as to the long term biological dangers, and where the safety lines are.
Regarding Electric Fields of 50-60Hz (AC Power), there is some rough consensus out there to keep below 10-20 V/m and sleep at a spot below 5 V/m, though again opinions vary. 5 V/m was the recommendation in Germany and by the IRPA/INIRC for “private individuals”, 10 V/m for “workers”, with 25 V/m for “workers” for max. 2 hours. ACGIH recommend 1 V/m for those with pacemakers or other electrically sensitive implants.
The fields in the lower frequency ranges are sometimes referred to as ELF (see chart below for usual acronym meanings of this sort), or even confusingly as EMF which is also often used to define such fields at most frequencies.
EMF(RF) FROM HIGHER FREQUENCIES:
At HIGH FREQUENCIES like those the high frequency meters measure, the magnetic and electric fields are coupled so strongly together that it is one field that is measured, usually in V/m or mW/cm2, etc.
For microwave ovens (2.45 GHz) biological exposure is often recommended to not exceed 5 mW/cm2 (milliwatts per cm squared), however again opinions vary.
Some school or hospital exposure limits for 300MHz-300GHz:
– France, Italy 10 mW/cm2 in schools
– Switzerland 9.5 mW/cm2 in schools, 4.25 mW/cm2 in hospitals
– Belgium, Luxembourg 2.4 mW/cm2
For RF Fields of 900MHz, exposure limit recommendations around the world appear to range from .001W/m2 to 4.5W/m2, the latter being in Germany and the ICNIRP recommendation in ’98.
For RF Fields of 1800MHz, exposure limit recommendations around the world appear to range from .001W/m2 to 9W/m2, the latter being in Germany and the ICNIRP recommendation in ’98.
The higher frequencies are often referred to as RF (radio frequency) frequencies (think cell phones, microwaves, etc.) and thus you’ll see some meters with “RF” in the title or description.
MAGNETIC VS. ELECTRIC FIELD MEASUREMENT:
AC MAGNETIC FIELDS are much harder to shield than electric fields. On the other hand unperturbed AC ELECTRIC FIELDS are much harder to measure accurately/dependably than Magnetic fields. IEEE tries to help with IEEE 644-1994. The inexpensive models don’t pretend to measure this as well as the Enertech Emdex II’s of the world, however they are often much less expensive and there’s your trade-off.
Note that AC ELECTRIC FIELDS often remain as long as the the source is plugged in, whether it is turned on or off.
So for biological concern, what do people care about, magnetic or electric fields? An engineer in the field that has been following this noted that in the 70’s it was electric fields, in the late 70’s and 80’s it was magnetic fields, and now it’s really both. Most inexpensive units are only good for detecting the PRESENCE of stronger fields (vs. measuring them well) and many only measure magnetic fields, and if they do measure electric fields it usually isn’t accurate. If you need to measure accurately and/or measure both magnetic and electric fields, I try to help out in this review with some leads later on.
Meters not designed for it avoid 0Hz since that is the natural ground DC static field and we usually want to ignore that for measurement. Also there is often comparatively little EMF produced 1Hz-40Hz (some European train systems do FYI – 16.7Hz). Thus meters often aren’t missing much EMF in the low frequencies when we buy meters that don’t cover below 30Hz-40Hz.
The frequency range of 30Hz/40Hz to 300Hz usually covers much of low frequency EMF produced in a home or office. This includes the U.S. 60 Hz AC power frequency and 4 of the harmonic frequencies from that. Thus we usually aren’t missing much EMF in the low frequencies when we buy meters that don’t cover over a few hundred Hz or so. However, note that capping the upper end of the low frequencies in the low hundreds may fail to capture a good portion of CFL’s EMF (compact fluorescent lights) if that is important to you.
Note that measured values can become less trustworthy as you get very close to the source of an EMF field, so measuring practically next to the source is often questionable.
Also note that pulsed EMF is usually not read accurately by EMF meters.
Note that if you need to take high radar frequency field strength into account (think Traffic Control Radar, Aviation, Naval, Military) because say you live near an airport and are wondering .. you’ll probably need a meter that reads in the 8.5GHz-9.5GHz range.
Note: I can’t imagine who might work so close to one, but keep CFL bulbs without specific UVB and UVC mitigation (think double-envelope eco bulbs, for example) more than 20cm/8″ from people at the bare minimum. If you don’t know the technology of your CFL bulb, might as well play defense.
FREQUENCY USE LEGEND:
– Static Field = 0Hz
– Some European electric rail = 16.7Hz
– Amtrak electric wire driven trains in U.S. southern NE corridor = 25Hz
– AC Power for home/business (much of Europe) = 50Hz
– AC Power for home/business(U.S.) = 60Hz
– U.S. AC Power natural harmonics = 120Hz, 180Hz, 240Hz, 300Hz, 360Hz.. up to 800Hz for most.
– 2Hz-100KHz includes many energy saving lamps, switching-mode power supplies, electronic dimmers, and monitors.
– Some specialty small/light/fast motors (some server rooms, aircraft, ships, some power tools, etc.) = 400Hz
– RF Animal Identification = 125KHz(U.S.) and 134.2KHz(Intl) (penetrates mud, blood, water)
– Dect 6.0 cordless phone (most secure, least conflict) = 1.9GHz
– Other cordless phones = 900MHz, 2.45GHz, 5.8GHz
– WiFi (802.11) = 2.45GHz or 5GHz
– Bluetooth = 2.45GHz
– Many radio control cars, planes, etc. = 2.45GHz
– RFID (Radio Frequency Identification .. EZ-Pass, supply mgmt,etc.) = 135KHz, 13.56MHz (13.553-13.567), 433.92MHz, 2.45GHz (2.4-2.483), 5.8GHz (5.725-5.875). Also, though probably not used as much, 6.765MHz-6.795MHz, 7.4MHz-8.8MHz, 26.957MHz-27.283MHz, 868MHz-870MHz, 902MHz-928MHz.
Hz = Hertz (1/sec frequency)
kHz = Kilohertz (1000/s)
MHz = Megahertz (1million/s)
GHz = Gigahertz (1billion/sec)
SOME ORGANIZATIONS REVIEWING
EMF/RF BIOLOGICAL EFFECTS:
Here are some of the more scientific organizations with available EMF/RF research or overviews that might be of interest to you:
ACGIH – American Conference of Governmental Industrial Hygienists.
IRPA – International Radiation Protection Association
SCENIHR – Scientific Committee on Emerging and Newly Identified Health Risks (European Union advisory group).
INIRC – International Non-Ionizing Radiation Committee
ICNIRP – International Commission on Nonionizing Radiation Protection
WHO – World Health Organization International EMF Project
U.S. EMF RAPID Program – 6 year working group put together in the past by NIEHS, NIH, and DOE.
NRC/NAS – National Research Council / National Academy of Sciences by way of National Academy Press
CA Dept. of Health Services – CA EMF Program
IEEE – Institute of Electrical and Electronics Engineers
VDB – Association of German Building Biologists (Verband Deutscher Baubiologen)
Further future related research discoveries are likely to involve, or at least be reported on, by one or more of these organizations as they have been involved in such research in the past (much of it you can find on the web).
HOW TO GET 3D READINGS FROM
FROM 3 XYZ AXES METER READINGS:
While some tools take “3D” readings, to save money some folks buy meters that read 1 or 3 individual axes, not a composite “3D” reading.
To make a “3D” reading out of the individual axes readings you are supposed to put each of the three axis meter readings into the equation “square root (x-squared + y-squared + z-squared)”.
However, here are some short-cut estimations for less demanding needs that some use:
Measurement Value:……Corresponding Guesstimate
1 High, 2 Low values….Use highest value
2 High, 1 Low value…..Use highest value plus half of second highest
3 similar values……..Use 1.5x highest value
– Keeping unit over 1ft away from any conductive material like metals.
– Putting unit on a non-conductive holder like dry wood or cardboard.
– Reading meter from 5 feet away.
– If measuring over a bed, measuring 2″ above mattress to take pillow into account and lessen the measurement effect of the springs (if there are any, of course).
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