Usually linked to wireless sources such as WiFi, phones, Bluetooth, smart meters and nearby masts.
Linked to voltage around wiring, sockets, extension leads, chargers and powered devices.
Linked to electrical current flow through appliances, cables, breaker panels and transformers.
EMF is not one single thing. In most homes and workplaces, electromagnetic fields can come from wireless technology, electrical voltage and electrical current flow. Each type behaves differently, so the correct measuring and shielding method depends on the field type and the situation.
RF stands for radio frequency. RF fields are commonly produced by wireless communication sources such as WiFi routers, mobile phones, Bluetooth devices, smart meters, baby monitors and nearby masts.
RF readings can rise and fall quickly depending on signal activity, data use, position and distance from the source. Most home RF meters show field strength, peak levels or changing activity rather than a laboratory-style waveform.
First step: measure RF levels near the likely source, then choose RF shielding based on the source, room layout and where you spend the most time.
Magnetic fields are linked to electrical current flow. They are more relevant near breaker panels, current-carrying cables, transformers, motors, appliances under load, power lines and nearby electrical infrastructure.
Unlike RF, magnetic fields are not usually about wireless signal activity. They are often more closely linked to current flow, load and source direction. This is why magnetic field shielding is different from standard RF shielding.
First step: measure near the suspected source path, then assess whether specialist magnetic shielding material is appropriate.
Electric fields are linked to voltage. They can exist around plug sockets, mains wiring, extension leads, bedside cables, powered lamps, chargers and desk electronics.
Electric fields can still be present around live wiring and powered cables even when a device is not heavily working. Distance, switching off unused devices, cable layout and grounding where relevant can all affect the result.
First step: check likely wiring and cable zones first, then choose suitable reduction methods where appropriate and safe.
| Field Type | Common Sources | First Step | Product Direction |
|---|---|---|---|
| RF | Often variable and signal-based. Readings may change with data use, device activity and distance. | Measure RF levels during normal device use | RF meter and RF shielding products |
| Electric | Sockets, wiring, extension leads, chargers, powered cables | Check voltage-related field levels near likely wiring zones | Electric field meter and grounded shielding where appropriate |
| Magnetic | Breaker panels, transformers, appliances, current-carrying cables | Measure near the suspected source path and under normal load | Magnetic field meter and specialist magnetic shielding material |
Most home EMF meters do not show a unique waveform shape for each field type. Instead, they usually show field strength, peak levels, averages or changing activity depending on the meter. This is why correct meter choice matters. A reading is most useful when it is taken in the right place, compared from the same position and understood alongside the source type.