Provides information on the issues associated with RF (Radio Frequencies) and ELF (Extremely Low Frequencies).
Pocket-sized and lightweight.
Includes a light (flashing) where the frequency of illumination reflects the strength of the field being measured, ie. the unit flashes when exposed to an energy field and the faster the flashes, the stronger the field being measured.
Includes an audible alarm (the volume of which can be controlled) to indicate the strength of a given field.
