The Lasair II 350L counts particles as small as 0.3 microns while sampling at 50 LPM. The higher flow rate samples one cubic meter in only 20 minutes. The software walks the user through the full certification process and then automatically generates a full final report. The particle counter has complete sampling and recipe features yet is easy to use. The unit, including the battery, weighs 15.5 pounds and comes with a chemically resistant easy-to-sterilize cover.