Sequoia is the sole manufacturer of the LISST series laser particle size analyzers. The array of instruments originated with applications in the marine environment, but now includes diverse fields such as stream-gaging, paper emulsifier optimzation, airborne cloud dropet measurements and others still in development. Some of these instruments deliver the optical volume scattering function (VSF) of interest to optical oceanographers.


The LISST series includes submersible and non-submersible instruments. All employ the small-angle forward scattering principle, also called low-angle laser scattering or laser diffraction.