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
인광계를 사용하여 물체의 형광을 측정할 수 있습니다.ingwanggye-reul sayonghayeo mulche-ui hyeonggwang-eul cheugjeonghal su itsseumnida.You can use the phosphoroscope to measure the fluorescence of an object.