Indoor or outdoor sampling of airborne particulates 0-70 cubic feet per minute (cfm) [0-2 cubic meters per minute (cmm)] flow range Spot or continuous monitoring Portable and lightweight Built-in rotometer for instantaneous flow reading Includes 4" (10.16 cm) diameter filter holder assembly For use in normal, non-explosive atmospheres Complete accessories available for use with Total Suspended Particulate (TSP), PM10 and PM2.5 Systems for U.S. EPA compliance Made in U.S.A. ???????