The EnergyTech 301 is a low-cost dust monitor that uses tribo-electric sensor technology to directly measure particulate concentration. It can monitor ducts from 250mm to 5m in size, requires minimal maintenance, and provides accurate measurements from 0.07 to 6500 mg/m3. The monitor has integrated calibration functions, alarm outputs, RS485 and 4-20mA outputs, and is suitable for a wide range of applications.