Professional air quality monitoring with unique face mask testing capability. The DC1100 PRO with Mask Test combines all the features of the DC1100 PRO with a specialized mask efficiency test mode, allowing you to quickly and easily measure the filtration performance of face masks, respirators, and other protective equipment. This specialized model detects particles down to 0.5 microns (bacteria, mold) and 2.5+ microns (pollen, dust), with an innovative testing mode that makes it simple to evaluate mask effectiveness in seconds. Key Features Unique mask efficiency test mode: Quickly measure face mask and respirator filtration performance Simple 2-step testing: Set baseline to room ambient, then place mask over inlet to read efficiency Enhanced 0.5 micron sensitivity: Detects smaller particles including bacteria and mold spores Dual particle size detection: Monitors >0.5 micron (small: bacteria, mold) and >2.5 microns (large: pollen, dust) 30-day history storage: Review historical air quality data by minute, hour, or day Dynamic bar graph: LCD display shows real-time particle counts Perfect For Testing face mask and respirator filtration efficiency Comparing different mask types and brands Verifying protective equipment performance Professional air quality monitoring Healthcare and industrial safety applications Quality control for mask manufacturers How Mask Testing Works Set baseline reading to room ambient air quality Place mask over the device inlet Instantly see filtration efficiency percentage What's Included DC1100 PRO Air Quality Monitor with Mask Test mode User manual Specifications Particle size ranges: >0.5 microns (small), >2.5 microns (large) Special feature: Mask efficiency test mode Data views: Minute, hour, day history History storage: Up to 30 days on device Dimensions: 7" H × 4.5" W × 3" D Weight: 0.7 lb unit (2.2 lb shipping) Color: Black