Electromagnetic meters are devices used to measure electromagnetic fields, which are produced by electric currents and magnetic materials. These meters can detect and quantify the strength of these fields, helping to assess exposure levels in various environments, such as homes, workplaces, and industrial settings. These meters often come in handheld or portable forms, making them easy to use for both professionals and the general public. They can measure different frequencies and types of electromagnetic radiation, including those from radio waves, microwaves, and power lines, providing valuable information for safety and compliance purposes.