Airy Technology®Benchtop Particle Counters B7000 Series Benchtop Particle Counters Model B7301 0.3 – 25 µm @ 0.1 CFM with internal pump and battery MORE INFO Model B7501 0.5 – 25 µm @ 0.1 CFM with internal pump and battery MORE INFO Model B7300 0.3 – 25 µm @ 1.2 LPM with internal pump and battery MORE INFO Model B7501-30 0.5 – 75 µm @ 0.1 CFM with internal pump and battery MORE INFO B7301-AQM1 and B7301-AQM2Air Quality Monitors PM, CO2 , Temperature, RH, and TVOC MORE INFO B7300-AQM1 and B7300-AQM2 Air Quality Monitors PM, CO2 , Temperature, RH, and TVOC MORE INFO