The Guardian for PM10 or PM2.5 dust is a cost effective, fixed, long duration, dust monitor, factory configurable for single parameter monitoring of PM10 or PM2.5 using a sharp cut cyclone, based on our own Microdust. It is housed in a weatherproof enclosure. The unit is supplied with heated inlet and logger which allows data transfer. The unit runs on mains electricity only (110V or 240V). The data is transferred via GPRS to a dedicated, secure, website www.dataview247.com. This can be viewed in any web browser, via private login, showing real-time and historical data and in addition real-time alarms can be set up via email.