Radiance Research Nephelometer
General Operation
Download manual for Radiance Research M903 NephelometerThe Radiance Research nephelometer measures aerosol light scattering at a single wavelength (530 or 545 nm). It does not measure backscattering coefficient.
Some photos:

Barrow, Alaska
Trinidad Head, California
Mauna Loa, Hawaii
American Samoa
South Pole
Summit, Greenland
Seminars
Global Monitoring Division Review