A data hungry meter for people who want evidence rather than impressions. The EMF-390 reads magnetic field, electric field and RF power density, covers radio frequency to roughly 10 GHz, and includes a 2.5 GHz spectrum analyser view that shows which band is actually busy. Readings log to internal memory and export to a computer, so a night of measurements turns into a timeline instead of a memory. Power comes from a built in rechargeable cell charged over USB.
For investigations the logging is the selling point: a spike at 02:14 can be matched against audio and video afterwards. The display is small and the menus take a session to learn, and the RF sensitivity means every phone in the room shows up. Anyone who wants a single glance answer will be happier with a five LED meter.
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