... verification IAQ Investigation Food Process Investigation Hospital Surgical Room Filter Testing FeaturesMeasures 5 particle sizes; 0.3, 0. ... .83 l/min) Light SourceLaser Diode CalibrationPSL particles in air Counting Efficiency50% at 0.3 um; 100% for ... .2 lbs (1 kg) AccessoriesAC Adapter, Zero Filter OptionsIsokinetic Probe, Air Velocity Probe, Thermal Printer,Temperature/Relative Humidity Probe, ...