describe ET825 battery radiation tester radiation detection EMF detectors can test electric field radiation and magnetic field emissions to achieve better test results. It is widely used for testing and learning indoor and outdoor electromagnetic radiation. Electromagnetic radiation monitoring: homes and apartments, offices, outdoor and industrial sites. Electromagnetic radiation testing: radiation testing for mobile phones, computers, televisions, refrigerators, and high-voltage cables. Radiation protection product testing: testing the effectiveness of riot clothing, radiation protection films, and other protective equipment. Equipped with a built-in electromagnetic radiation sensor, the radiation value can be adjusted on a clear LCD digital display screen after being processed by controlling the microchip.