Sequoia Scientific

Since 1995, Sequoia Scientific has pioneered submersible and field measurement technologies for suspended particles and particle size distributions. Our LISST series of aquatic science sensors revolutionized the industry, with over 40 sensor types developed and thousands of instruments deployed globally. Headquartered in Bellevue, WA, we handle all design, production, and sales in-house, serving oceanographers, freshwater researchers, and industrial clients. Our instruments operate in diverse environmentsfrom the Grand Canyon to the Deepwater Horizon oil spill siteproviding critical data for environmental monitoring and scientific research. We combine laser diffraction, holography, and acoustic backscatter methodologies to deliver precise measurements of particle size, concentration, and optical properties. Our teams expertise spans decades, ensuring robust solutions for marine science, hydropower, oil and gas, and freshwater sediment transport applications.

We prioritize user-friendly software, durable hardware, and lifelong calibration stability, enabling seamless integration into CTDs, gliders, and laboratory systems. Our commitment to innovation is evidenced by partnerships with leading institutions like NASA and the University of Hawaii, advancing global understanding of aquatic ecosystems. With dedicated technical support and rapid service response, we ensure minimal downtime for clients ranging from academic researchers to environmental consultants. Our instruments have supported groundbreaking studies on particle aggregation, phytoplankton dynamics, and sediment transport, cementing our reputation as a trusted leader in particle intelligence.