TSI 8530 DustTrak II Desktop Aerosol Monitor - Portable dust and particle monitor, light scattering laser photometer. Measures concentrations of a single dust fraction corresponding to either PM1, PM2.5 or PM10. Aerosol concentrations .001~ 150mg/m3. Used for industrial/occupational hygiene surveys, indoor air quality monitoring, outdoor environmental monitoring, baseline trending and screening etc... Includes AutoZero Module