Sequoia Scientific, Inc.

Sequoia Scientific, Inc. makes submersible and field instruments for measuring particles and their properties in water and related environments. The company centers its work on "particle intelligence," and its LISST systems are built around laser diffraction, holography, acoustic backscatter, optical scattering, transmission, and hyperspectral absorption methods. These instruments are self-contained, compact, programmable, and battery-powered, with calibration that is held "for life," and they support autonomous data collection and integration into broader measurement systems. The product line covers particle sizing, particle concentration, imagery, beam attenuation, volume scattering function, depolarization, settling velocity, dissolved and suspended material absorption, and related optical properties. In marine settings, the company offers instruments for oceans, coasts, ports, and onboard laboratory use, including devices for particle size distribution, optical transmission and beam attenuation, underwater holographic imaging, flow-through particle measurement, and autonomous VSF measurement. In freshwater settings, it offers tools for river sediment transport and monitoring, including profiling instruments for river columns and sensors for suspended sediment concentration. In energy applications, its instruments serve hydropower and oil and gas work, including turbine protection and on-site measurement of drill mud and brine. The company covers environmental, stormwater, monitoring, dredging, aquaculture, oil-spill response, harmful algae bloom detection, and laboratory applications as well. Distinctive features include in-situ operation, submersible designs, depth ratings ranging from shallow to deep deployments, integrated sensors such as depth and temperature, support for external analog sensors, and long-term deployment options through accessories like battery packs and anti-fouling systems. Sequoia sells radiative transfer models for optical analysis and includes accessories, software, and support resources as part of the overall offering. The company serves researchers, operators, and system integrators who need direct measurement of particles, optics, and sediment behavior in aquatic and industrial settings.