Photo-Acoustic Soot Spectrometer, Single-Wavelength (PASS-1):  The PASS-1 is a very sensitive, high resolution, fast response instrument for measuring the absorption coefficient of aerosol particles. This instrument has no filters to change and requires no intervention by the operator. The PASS is ideal for air quality and biomass burning studies, as well as for documenting pollution plumes from power plants, urban areas or other sources of black carbon emissions such as diesel exhaust emissions.   read more =>

Photoacoustic Soot and Aerosol Sensor, Three Wavelength (PASS-3):  This product will be using three wavelengths (red, green, and blue) to enhance measurement capabilities. Please check back to see full information on the exciting capabilities of our PASS-3.

Single Particle Soot Photometer (SP2):  This is the only instrument in the world that directly measures the black carbon, known as soot, in individual aerosol particles. The high sensitivity, fast response, and specificity to elemental carbon makes it the premier instrument for characterizing pollution sources, soot in snow, ice or water, calibrating aethalometers and documenting thin, atmospheric layers of contamination.   read more =>