Current systems in use or under consideration: Arecibo, European Southern Observatory, USGS Hawai'i Observatory, Ligo Hanford, Lick Observatory, National Radio Observatory, Las Cumbres, Palomar Observatory, Aura Gemini, W.M. Keck, Geronimo Creek, Big Bear Solar Observatory, Ligo Livingston, University of Texas McDonald, Lamont Doehrty, Australian Astro Observatory Model 212 Eight Channel Particle Counter Ambient profiling of aerosol particulates has been simplified by the Met One Instruments Model 212 Ambient Particulate Profiler. The 212 sizes and counts particles in eight digital bins, and reports the information on command. Each of the eight channels may be field configured to customer requirements. A Remarkably Flexible, Higher Performance Instrument Featuring: Eight Real–Time Channels Simple operation Self–Contained Weatherproof package Low Power Sheath air technology Low Cost 0.5μm to 10μm(typical) range, ex...