I'm glad I brought this device. I have magnet waves throughout my apartment. They're strongest in my bedroom. I can't rearrange my room. I tried pulling the bed from the wall as far as I can. I was shocked as I check electrical devices. Some of them still emit electrical and magnetic energy when they're turned off. I live in an old building. Computer, monitor, and Wi-Fi box all transmit strong, dangerous waves. My Sony TV seems to be okay, It might be well shielded. It was the only device I checked that I didn't get any readings. When the refrigerator's motor turns on, the magnetic reading are high.