Choose the right instrument
List the source and field type first. An RF-only instrument cannot measure low-frequency magnetic fields from mains wiring. Check the instrument’s documented frequency range, sensing axes, units, and response mode. A label such as “5G ready” does not mean coverage of every frequency used by mobile networks.
Keep the conditions consistent
Record the room, exact position, meter height, orientation, mode, and device activity. Follow the instrument manual on how to hold it. Keep your own position consistent because your body and nearby objects can affect readings. Compare like with like: a peak reading should not be compared with an average as if they were interchangeable.
Repeat before drawing conclusions
Wireless activity and electrical loads change over time. Take repeated readings at the same points and note the time and operating conditions. If testing a change, collect a baseline, make one change, then repeat the measurement. The resulting difference describes that setup; it is not proof of a health benefit.
Know when a consumer survey is insufficient
A broadband meter generally cannot identify every transmitter contributing to a reading. A display at its minimum may mean the signal is below the detection floor, not absent. For compliance assessments, unexplained electrical problems, or measurements requiring traceable accuracy, seek a suitably qualified professional. Do not open wiring or modify electrical equipment to investigate a reading.