The Particle Measuring Systems Lasair III portable particle counter sets the standard for aerosol particle counters. The on-board Pulse Height Analyzer (PHA) ensures ISO 21501-4 compliance. The large IR touch screen controls and intuitive user interface make the system very easy to use. The particle counter's rugged enclosure is chemically resistant and lightweight for portability. The enclosure also has a streamlined design that minimizes particle traps and makes the unit easy to clean.