An Electromagnetic Field Meter (EMF meter) is a device used to measure electromagnetic fields in the environment. These fields are produced by various sources, including electrical appliances, power lines, and wireless communication devices. EMF meters can help identify areas with high electromagnetic radiation, which some people believe may have health implications. There are different types of EMF meters, including gaussmeters and RF meters, each designed to measure specific frequencies of electromagnetic fields. Users often employ these meters in homes, workplaces, or during investigations of paranormal activity, as some believe that unusual EMF readings may indicate the presence of spirits.