CHMLAB® Quartz Microfiber Filter, Up to 900℃Made of Pure Quartz Microfibers, Quality TraceableHeavy Metal Concn.·Pollution Measurement at High Temp.석영 섬유 필터, 내열성, 내약품성, 대기 오염·중금속 농도 측정 (DH20030300P1234)