The Fluke 985 Indoor Air Quality Particle Counter, 6 Channels is an essential tool in the facility maintenance, HVAC and IAQ professional's toolbox. From filter testing to indoor air quality investigations, the particle counter equips the user with valuable data concerning the concentration and source of particulates in the tested environment.The 985 is ideal for troubleshooting and monitoring indoor air quality issues and verifying HVAC filter performance and critical locations for ISO Class 5-9 certification. With the ultra-lightweight ergonomic design, easy to view color screen with intuitive icons, on-screen trend graphs for easy and quick analysis, this counter is a must-have for any maintenance, HVAC or IAQ professional.