The PF5 measures both electric fields and magnetic fields! These types of EMF originate from house wiring, electronics, appliances and much more. The PF5 is unique because it measures frequencies in a wide spectrum range, from 20 Hz to well over 50 kHz. This enables the PF5 to measure the higher frequency electric and magnetic fields emitted by induction cook tops, solar-panel inverters, "energy-saving" compact fluorescent (CFL) lamps and some LED lights. The PF5 is an easy to use, pocket sized EMF meter. It measures both electric and magnetic fields.