LOAC (Light Optical Aerosol Counter)
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Instrument and pump: 300 g 
Electric consumption: ~3 W 
No lenses => no risk of misalignment 
 
Concentrations for 19 size classes 
between 0.2 and 100 µm 

 
Automatic check every 10 minutes and electronic recalibration if necessary (ex. strong changes in ambient temperature) 
 
Total weight (gondola, batteries and LOAC): 
1 kg for use with meteorological balloons