"RIGH ANGLE SCATTER OPTICS,MULTIPLE SIZE RANGES SIMULTANEOUSLY MONITORED,COUNTS ALL PARTICLES 0.5 MICRONS IN SIZE AND LARGER,0.1 CUBIC FT PER MINUTE FLOW RATE,200000 PARTICLES PER CUBIC FT MAX RECOMMENDED CONCENTRATION,DIGITAL READ-OUT,POWER 115/230 VOLTS AC,50/60 HZ,SIZE 10-1/2 IN. H BY 16-3/4 IN. W BY 18-1/2 IN. DP"