INTERACTIVE LESSON & SIMULATOR
Interactive Simulator: How to Read EMF Meter Displays
Test virtual multi-field meters across RF power density, AC electric fields, and magnetic flux density before buying hardware.
What "accuracy" actually means here
For an RF meter, accuracy is usually expressed as a tolerance across a specified frequency range — for example, the Safe and Sound Pro II documents a ±6 dB response across 400 MHz–7.2 GHz. That single figure tells you two things at once: how much a reading can vary from the true value, and over what frequency range that tolerance was actually characterized. A meter that only advertises a detection range, with no stated tolerance, hasn't told you its accuracy at all — only what it can detect something within.
Why an unpublished spec can mislead
A meter without a published frequency-response curve can still show a number on its display with complete confidence — the display doesn't know whether the underlying antenna response is flat or wildly uneven across its stated range. Two meters can report the same detection range and disagree substantially on the same source, simply because their actual sensitivity varies differently across frequency. Treat an advertised range without a tolerance figure as a starting point for questions, not a settled claim.
What consumer meters are genuinely good for
Within their documented range and tolerance, consumer meters are useful for relative, repeatable comparisons: is this spot louder than that one, did a change reduce the reading, does a specific device produce a noticeable spike. That's a meaningfully different job from producing a regulatory-compliance-grade measurement, which requires calibrated lab equipment, controlled conditions and a documented measurement protocol that consumer instruments are not built or certified to provide.
How we chose which meters to document
We prioritize instruments with manufacturer-published specifications we can link to directly, and we say plainly when a figure is a detection range rather than a stated accuracy. See our guide to choosing a meter for how to read those specifications, and the meter profiles for the documented figures themselves.