Labtron Handheld Airborne Particle Counter is a six-channel, microcomputer-controlled device that counts particles in 6-size ranges with a 0.1 CFM (2.83 L/min) flow rate. It supports Class 100 to 300,000 testing and features a high-resolution LCD screen, ft³/m³ data conversion, delay time, zero count, and 260,000 record storage.