Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
자력계는 지구의 자기장을 측정하는 데 사용됩니다.jaryeokgye-neun jiguu-ui jagijang-eul cheugjeonghaneun de sayongdoemnida.A magnetometer is used to measure the Earth's magnetic field.