Battery-powered, handheld Microdust Pro has 1 µgm -3 to 2,500 mgm -3 range for assessing suspended matter concentration. It monitors microscopic particles using near-forward light scattering technology and 12 to 20 deg scatter range. Airborne particulate monitor presents data with scrolling graph on LCD screen. Internal logger stores up to 15,700 data points over 32 separate runs, and data are downloaded to PC/printer via RS232 interface cable.