Airy Technology®Handheld Particle Counters H8000 Series Handheld Particle Counters Model H8306 0.3 – 25 µm @ 0.1 CFM with internal pump and battery MORE INFO Model H8506 0.5 – 25 µm @ 0.1 CFM with internal pump and battery MORE INFO Model H8303 0.3 – 25 µm @ 0.1 CFM with internal pump and battery MORE INFO Model H8503 0.5 µm – 25 @ 0.1 CFM with internal pump and battery MORE INFO Model H8506-30 0.5 µm – 25 @ 0.1 CFM with internal pump and battery MORE INFO Model H8300 0.3 – 25 µm @ 1.2 LPM with internal pump and battery MORE INFO Models H8301-AQM1 and H8301-AQM2 (CO2, Temp, RH and TVOC) with internal pump @ 2.83 LPM and battery MORE INFO Models H8300-AQM1 and H8300-AQM2 (CO2, Temp, RH and TVOC) with internal pump @ 1.2 LPM and battery MORE INFO