actually good quality. the only thing I don't like is that if you shake it at all it goes all the way up to red as if it's detecting magnetic field it's very sensitive if you tap it or shake it you have to keep your hand completely still or else it tells you that there's a high emf

detector work just as it should, thank you!

Точный детектор электромагнитного излучения - портативный, USB, работающий от батареи для измерения нескольких устройств