Before changing anything, write down what your home measures today. Without that record, every later fix is a guess, and you cannot tell a real improvement from a hunch.
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What goes into a baseline
Take a baseline for each field type, since one meter mode covers only one
Measured in mG or µT
From current in wiring, power lines, motors and appliances. Read it with a gaussmeter or the magnetic mode of a multi-field meter.
Measured in V/m
From voltage on unshielded cords and wiring, even with nothing switched on. Read it with an electric-field mode; grounding changes the reading.
Measured in µW/m² or V/m
From phones, Wi-Fi, Bluetooth, cell towers and smart meters. Read it with an RF meter whose range covers the bands you care about.
Noise on the wiring
High-frequency noise riding on the mains, conducted rather than radiated. A field meter cannot see it; it needs a plug-in line-noise meter.
A baseline for each field, not just one.
Each field type needs its own sensor; a meter that reads one says nothing about the others.
Chart: frequencyblockers.com: Take a baseline for each field type, since one meter mode covers only one
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Radio-frequency, magnetic and electric fields behave differently, and a meter set to one mode tells you nothing about the others. Take a pass for each field type you care about, in each place you spend time.
- The bed, at pillow height, and the spot where you sit most evenings.
- Your desk or work area, at the height of your chest and head.
- The kitchen, near the microwave and the stove.
- Beside the router, and a few steps away from it.
- Next to chargers and power strips where you leave devices overnight.
Baseline measurements let you prioritize (fix the worst spots first) and verify (did my changes actually work?).
Taking the readings so they can be compared
Label each location and use the same height every time, so a later reading can be compared with this one. Record the state of the house at the same time: which appliances are running, whether the Wi-Fi and Bluetooth are on, and what time of day it is.
Measure at different times: some EMF sources are intermittent. Check with appliances on and off, WiFi on and off, etc.
For radio frequency, take one reading with devices as you normally use them and another with them off. For magnetic and electric fields, switch the nearby appliance on and off while the meter stays in place. The difference shows you which source is responsible.
Putting the numbers in context
Research note: In Switzerland, median ELF magnetic fields were highest in train stations (0.48 uT) and trains (0.40 uT), and in living rooms near 220-380 kV lines (0.37 uT) [2].
For scale, all Swiss ambient ELF magnetic field measurements were well below the ICNIRP 1998 limit, at a median of 0.2%, and appliance magnetic fields drop drastically with distance, with no clear dependence on the appliance’s power consumption [2][3].
A consumer meter is a rough guide, so use your own baseline as the main comparison rather than a single published number.
TriField TF2 EMF Meter
A three-mode meter for the baseline. Record the spot, the time and what was running for each reading, so later readings can be compared fairly.
View ProductWhat a baseline cannot tell you
Measurements describe fields. They do not tell you whether a given level is harmful, and the research summarized below is the better guide to that. If a phone turns out to be the main source in your home, a comparison of Faraday bags and airplane mode explains the options.
The IARC classification of radiofrequency fields as possibly carcinogenic rested on limited evidence about brain cancer risk. A later WHO-commissioned meta-analysis found that ever or regular mobile phone use was not associated with glioma risk (pooled relative risk 1.01, confidence interval 0.89-1.13), and the US National Cancer Institute says the evidence to date suggests cell phone use does not cause brain or other kinds of cancer in humans [4][5][6].
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Get the Complete GuideFrequently Asked Questions
Why is it important to get a baseline EMF reading before starting protection?
A baseline EMF reading gives you a starting point to measure against, allowing you to track whether your protection efforts are actually working. Without knowing your current exposure levels, you can’t determine if changes you make are having a real impact on reducing EMF in your environment.
What are the main sources of EMF exposure in my home?
Both natural and artificial EMFs surround you daily. Man-made sources include Wi-Fi routers, cell phones, power lines, and electrical appliances, while natural sources come from the earth and sun. In a 24-hour study of volunteers, excluding their own phone use, environmental RF exposure came mostly from other people’s mobile phone calls (37.5%), cordless DECT phones and docking stations (31.7%) and base stations (12.7%) [1].
How do I measure EMF levels in my home?
You can use an EMF meter to measure electromagnetic field exposure in different rooms and around specific devices. Taking measurements at various locations and distances will help you identify hotspots and establish your baseline for tracking improvements over time.
What distance factors should I consider when measuring EMF exposure?
Distance is one of the key factors determining your EMF exposure level, as electromagnetic fields weaken with increased distance from their source. By measuring EMF at different distances from devices and power sources, you can identify the lowest-reading areas in your home [2] and understand where protective measures like Faraday bags or RF shielding would be most beneficial.
References
- Bolte JF et al. Personal radiofrequency electromagnetic field measurements in The Netherlands: exposure level and variability for everyday activities, times of day and types of area. Environment international (2012). PMID 22906414
- Loizeau N et al. Extremely low frequency magnetic fields (ELF-MF) in Switzerland: From exposure monitoring to daily exposure scenarios. Environment international (2024). PMID 39647411
- Kenji Tanaka et al. Quantification of Low Frequency Magnetic Fields Generated by Household Appliances. IEEJ Transactions on Fundamentals and Materials (2009). doi:10.1541/ieejfms.129.627
- Mireille B. Toledano et al. Cohort profile: UK COSMOS, a UK cohort for study of environment and health. International Journal of Epidemiology (2015). PMID 26534947
- Karipidis K et al. The effect of exposure to radiofrequency fields on cancer risk in the general and working population: A systematic review of human observational studies – Part I: Most researched outcomes. Environment international (2024). PMID 39241333
- US National Cancer Institute Cell Phones and Cancer Risk. US National Cancer Institute (current). source
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
