Siemens QSA2700 Dust Particle Monitor is designed to measure and transmit indoor concentrations of PM2.5 and PM10. This  QSA series has 3 different models QSA2700  is without a display(3-color LED service indication), QSA2700D is provided with an LCD display and AQS2700 acts as a Sensor module for replacement.it is also a MODBUS Communication Option
Applications: Home, Office, IT Parks, Waiting halls, Residentials, etc