This page features select testimonials about Sequoia products.
“We are interested in studying pine pollen floating on the water, and in particular how it modifies the water color in the Baltic Sea. This color change affects remote sensing measurements. We have improved our methodology and research technique by using the LISST-100X to measure the size and concentration of the pollen in situ.”
“The LISST-200X with the scoop worked well for our data collection in the Mississippi River. In the summer of 2018, we did field work near Chester, Illinois and St. Louis, Missouri. At both locations, we deployed the LISST-200X (with scoop) attached to a standard torpedo weight. This allowed us to easily configure the LISST-200X so that it was parallel with the river flow during deployment, and we could measure suspended sediment size and concentration with minimal disturbance. The LISST-200X sediment data we collected were of high quality and formed the basis for a successful M.Sc. thesis (Martinez MJ (2019): Investigation of suspended-sediment concentration in the Mississippi river using laser diffraction and remote sensing surrogate methods. Download thesis here.).”
Dr. Amanda Cox
Saint Louis University (USA)
“The LISST-200X can be used for in-situ determination of particle size spectra and volume concentrations, but it can also be used as a laboratory particle size analyser. In our research, we used both LISST-200X and FlowCAM to validate the size distribution of Microcystis colonies from 50 um to 500 um. We found very good agreement between the Microcystis Chlorophyll a and the volume concentration from the LISST-200X and FlowCAM over a wide range of Chlorophyll a concentrations.”
Dr. Xingqiang Wu
Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences (China)
“Our two LISST-100Xs have consistently provided us with high quality data for various field projects conducted over the past 10 years, in environments ranging from rivers and lakes to the coastal ocean. We’ve relied on our LISSTs for environmental monitoring, sediment transport model calibration and validation, and scientific research, and have experienced nearly 100% data return for thousands of vertical profiles and months’ worth of moored time series.
Further, we have received exceptional technical support for our LISST-100Xs. About nine years ago, one of our LISST’s lasers became misaligned during shipping. One of Sequoia’s technicians spent over 2 hours on the phone with our field staff to talk us through the alignment procedure until it was corrected. As the result of this remarkable service, our fieldwork proceeded as planned, which saved thousands of dollars and valuable time.”
Grace Chang, Ph.D.
Marine Science and Engineering
Integral Consulting Inc. (USA)
“…I have to compliment the service provided by Sequoia that has been outstanding, all at no additional charges. LISST-VSF is an excellent instrument, when it is carefully calibrated. With the calibration we developed, we were able to measure the VSFs of particles of very clean seawater in the North Pacific Ocean that have been filtered through 0.2 um.”
Xiaodong Zhang, Ph.D., Professor
University of Southern Mississippi (USA)
“Our LISST-100 has been in operation for 20+ years on multiple field studies, ranging from the frigid waters of Greenland and Canada over Danish coastal waters to tropical waters in Vietnam and Costa Rica. It has travelled tens of 1000’s of miles on planes, cars and research vessels and has been returned for service/repair only once in that period.”
Thorbjorn Joest Andersen, Ph.D., Professor
Department of Geosciences and Natural Resource Management
University of Copenhagen (Denmark)
“You and your team have released a very impressive upgrade (LISST-200X). I do confess to having a bit of LISST envy, even though my 100X is and continues to be a key component of my field programs.”
Anonymous scientist not allowed to endorse any product.
“A long term client, at China East Normal University we have purchased 5-6 LISST products over the years, including LISST-100X and LISST-200X. As the state key laboratory, we use LISSTs to study coastal dynamic geomorphology and dynamic sedimentary process in the Yangtze estuary. The LISSTs are very accurate instruments, that are very easy to operate. We will continue using them in our research and we also a plan to use the LISST-ABS to study high-concentration sediment movement near the bed during storms.”
Professor Mr. Zhang Wenxiang
State Key Laboratory of Estuary and Coastalology, China East Normal University (China)
“At Gravity we have used the LISSTs for fieldwork around the globe since 2009. Our LISST-100X units (we have three) have been critical for optimizing high volume sampling programs for trace metals, and we have incorporated the LISST-100X as part of our SOP for trace metal sampling, in cooperation with the US Environmental Protection Agency. Our LISST-Deep made it possible for us to respond rapidly to the Deepwater Horizon accident in 2010 and we were able to provide data regarding the oil droplet size and concentration for the underwater plume modelling and tracking effort. Our LISST-ABS has been a key component for multiple environmental impact assessment programs carried out in connection with offshore drilling and for use in our real-time construction monitoring buoys. Our LISSTs have made it possible for us to improve our field programs and gain new business, which we otherwise wouldn’t have had. Furthermore, Sequoia has provided outstanding technical support, service and help at short notice whenever the need arose, making sure that our fieldwork schedules were not compromised, thereby saving us money and time.”
Mr. Shawn Hinz, Managing Partner
Gravity Marine (USA)
“We purchased the LISST-100X a couple of years ago and we do the sediment measurement on the Hei River, which is the boundary river between China and Russia. The LISST-100X can give us very accurate particle size distribution and concentration compared with our traditional manual analysis.The LISST-100X has saved us a lot of time. We have created our own protection/deployment frame and now we can mobilize the system anytime and anywhere. Thanks for this fantastic product. Next stage we will try the brand new LISST-SL2 for our measurements.”
Mr. Le Zhudi
Heihe Hydrology Bureau of Heilongjiang Province (China)