Portable dust and particle monitor, light-scattering laser photometer. Measure concentrations corresponding to PM1, PM2.5,. PM4 and PM10. Aerosol concentrations 0.001 to 150mg/m3. Used for industrial/occupational hygiene surveys, indoor air quality monitoring, outdoor environmental monitoring, baseline trending and screening etc... Will size particles in 4 sizes PM1, PM2.5, PM4 and PM10. Includes AutoZero Module