CHMLAB® Quartz Microfiber Filter, Made of Pure Quartz Microfibers, Up to 900℃Heavy Metal Concn.·Pollution Measurement at High Temp., Quality Traceable 석영 섬유 필터, 내열성, 내약품성, 대기 오염·중금속 농도 측정 (DH24CAT00001326)