Air Quality Monitor Handheld Professional Pollution Meter Dust Particle Counter Sensor Detector Tester Item Type: Air Quality Monitor Material: ABS Particle Detection Range: 0.3μm to 10μm Particle Size: 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, 10μm Counting Efficiency: 50% at 0.3μm, 100% at >0.5μm (in accordance with ISO 21501 4 and JIS) Particle Size Resolution: <15% at 0.5μm (in accordance with ISO21501 4) Sampling Flow Rate: 2.83L/min (0.1ft³) Tolerance: 5% (2,000,000Particles/ft³) Battery: Built in lithium ion battery 1 x 3.7V 2000mAh (Included) Operating Temperature: 0°Cd to 50°C Operating Humidity: 10%RH to 90%RH No frost condensation Storage Temperature: -20°C to 60°C Storage Humidity: 0 to 95%RH no frost condensation