EMF Devices Explained: Meters, Shielding and Product Claims

What does the device actually do?

An EMF meter is a measuring instrument. A fabric, enclosure or film marketed as shielding is a different product. A sticker marketed as a health accessory is a different proposition again. Start by identifying the job being claimed before comparing ratings or prices.

Reading a meter or material specification

For a meter, look for its frequency range, units and intended use. For shielding material, look for the frequency and conditions used in the test. A measurement of one material in a test fixture does not establish a health benefit or predict how a finished product will perform in your home.

When the product is an attachment for a phone

Phone reception can change when an accessory is attached. The FTC specifically warns about products marketed as cell phone radiation shields. Our phone case and sticker guide explains that narrower question and the options that do not require buying an accessory.

Sources: the FDA’s overview of cell phones and radiofrequency energy and the FTC’s consumer guidance on radiation shields.