Labtron Portable Airborne Particle Counter with a 2.83 L/min flow rate and 6 particle size channels (0.3 µm to 10.0 µm). Supports Class 100 to 300,000 testing with 10 levels (1 to 10 min). Operates from 10℃ to 35℃ and includes a built-in thermal printer for easy data output.