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
이 탁도계는 물의 탁도를 측정하는 데 사용됩니다.I takdogye-neun mul-ui takdo-reul cheugjeonghaneun de sayongdoemnida.This turbidimeter is used to measure the turbidity of water.