YSI provides monitoring equipment and services to governments, universities, and private organizations whose goal is to make the best use of natural resources. Products include: Multiparameter sondes for unattended monitoring and profiling of water quality; Multiparameter instruments for sampling water quality; Acoustic Doppler meters for measurements of velocity, tides, and currents; Buoys with full array of monitoring instrumentation, data acquisition systems, and meteorological sensors. Our trusted solutions help water resources professionals - throughout the aquaculture, coastal/estuaries, drinking water, ground water, storm water, and surface water industries - obtain the quality data needed to make informed decisions about critical projects.