The monitor can simultaneously measure fine particulate matter (PM-2.5), coarse particulate matter, and PM-10 mass concentration. This monitor consists of two filter membrane dynamic measurement systems (FDMS) and two TEOM quality sensors located in a single chassis, as well as a ready to use network configuration (including a control system with a touch screen user interface). The TEOM 1405-DF monitoring instrument adopts direct mass measurement method, which is not affected by measurement uncertainties caused by other alternative technologies, thus standing out from other particulate matter measurement methods. Provide true quality measurement with self reference and NIST traceability.