Which EMF meter do you actually need?
"EMF" covers three different kinds of field, and no single sensor reads all three the same way. Before comparing models, decide which field you are trying to measure:
| Field | Typical source | Unit | What to buy |
|---|---|---|---|
| Radio frequency (RF) | Wi-Fi routers, cell towers, 5G small cells, smart meters, cordless phones, Bluetooth | µW/m² or mW/m² | An RF meter or personal RF monitor |
| Magnetic (AC, low frequency) | House wiring, transformers, panels, motors, power lines | milligauss (mG) or µT | A gaussmeter, ideally triple-axis |
| Electric (AC, low frequency) | Unshielded wiring, lamps, extension cords, bedside electronics | V/m (or body voltage in mV) | A 3-field meter or a body-voltage meter |
If you want one device for a whole-home survey, buy a 3-field meter that reads RF, magnetic and electric fields. If you already know your issue is a cell tower or a smart meter, a dedicated RF meter will give you far better resolution for the money.
The five specifications that matter
- Frequency range. Anything sold as "5G-ready" should read well above 6 GHz. Older RF meters stop at 3.5 GHz and will under-report modern networks.
- Single-axis vs triple-axis. A single-axis sensor only reads the field component aligned with it, so you must rotate the meter and take the maximum. Triple-axis reads all three at once — faster and much harder to get wrong.
- Peak vs average. Digital signals are bursty. Average-only meters read low. Look for peak hold or peak/average switching.
- Readout units. µW/m² is the standard for RF exposure comparisons and for building-biology guideline tables. Meters that only show a bar graph or a colour cannot be compared against a guideline.
- Sensitivity floor. Bedroom-level assessment needs a meter that resolves down to single-digit µW/m². Consumer detectors that start at 1 mW/m² will show "zero" in a room that still exceeds sleeping-area guidance.
How the tiers compare
| Tier | Typical price | Good for | Representative models |
|---|---|---|---|
| Entry / awareness | $60–$100 | Finding hot spots, checking wiring, first look at a bedroom | DBTector DB-200EM, LATNEX Gaussmeter MG-300 |
| All-round 3-field | $150–$220 | Whole-home surveys, one meter for RF + magnetic + electric | TriField TF2, Cornet ED88T Plus, CORNET ED98 QPro5G, LATNEX AF-3500 / AF-5000, ESI 24 |
| Dedicated RF | $150–$400 | Cell tower, 5G and smart-meter work; before/after shielding tests | LATNEX HF-B3G and HF-B8G, Gigahertz Solutions HF32D / HF35C, Cemprotec 34 |
| Professional | $500–$3,000 | Consulting, reports, certification-grade measurement | Gigahertz Solutions HF38B / HF59B, Frequency Master IV, FieldSENSE 60 |
| Spectrum analysis | $180–$2,000 | Identifying which source and which band | RF Explorer series, LATNEX SPA series |
Prices are indicative bands; see each EMF meter product page for current pricing and stock.
Common mistakes
- Buying a "ghost hunting" detector. Uncalibrated single-LED detectors cannot produce a number you can act on or compare.
- Measuring once. RF varies through the day; magnetic fields follow household load. Take readings morning, evening and overnight in the same spot.
- Measuring against your body. Hold the meter away from you at arm's length — you absorb and reflect RF.
- Ignoring the electric field. The most common bedroom finding in real surveys is an elevated electric field from wiring behind the headboard, not RF from outside.
Measure, shield, then measure again
A meter is the instrument for the whole project, not the fix. Once you have baseline numbers, shielding is chosen against them: shielding paint and window film for RF entering a room, shielding fabric for canopies and curtains, and magnetic shielding film for low-frequency magnetic sources, which paint will not touch. Re-measure in the same positions afterwards — that difference, in µW/m² or mG, is the only proof the work succeeded.
Not sure what your readings mean? See safe EMF levels for humans for the guideline tables, and our current meter picks.