An EMF meter is a device used to measure electromagnetic fields (EMF) in the environment. These fields are produced by various sources, including electrical appliances, power lines, and wireless devices. EMF meters can help identify areas with high levels of electromagnetic radiation, which some people believe may have health implications. There are different types of EMF meters, including analog and digital models. Analog EMF meters use a needle to indicate the strength of the electromagnetic field, while digital EMF meters provide numerical readings on a display. Users often employ these devices in homes, workplaces, and during investigations related to paranormal activity.