Profile: YSI, Inc. is a manufacturer of sensor technology. We are an ISO 9001, ISO 14001 and ISO 13485 certified company. We provide sensors, instruments, software & data collection platforms for environmental water quality monitoring and testing. We offer products such as EcoMapper, EcoNet, Verticle Profilers, Buoys & floating platforms, underway sampling system, systems integration, Professional Plus and process monitor. Our EcoMapper is a autonomous underwater vehicle designed specifically for mapping water quality, water currents and bathymetry. Our Professional Plus is a handheld multiparameter meter provides measurement for the variety of combination such as dissolved oxygen, conductivity, specific conductance, salinity, resistivity and total dissolved solids.