Labtron Handheld Airborne Particle Counter with 2.83 L/min flow rate and 6 size channels (0.3 µm to 5.0 µm). Supports Class 100 to 300,000 testing, with 15 test periods (1 to 15 min). Operates from 10℃ to 35℃, and converts data in ft³ and m³. Perfect for precise particle monitoring.