Measures airborne particulate concentration (dust, smoke, mists, and fumes) in real time, and sounds an audible alarm whenever the user-defined level is exceeded. In contrast to conventional air quality monitoring methods, the pDR-1000AN alerts you to a problem within seconds, allowing you to take immediate action. With the data-logging enabled, this instrument automatically tags and time stamps the data collected, and stores it for subsequent retrieval/printout/graphing through a computer.