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The YSI ProODO dissolved oxygen meter utilizes ODO® technology, an optical-based sensor, to measure dissolved oxygen. Optical-based sensors drift less than membrane covered sensors and are capable of holding their calibration for several months. In addition, ODO sensors require less maintenance as there are no membranes to change and no electrodes to polish. ODO is a non-consumptive technology meaning oxygen is not consumed during the measurement. Therefore, no stirring is required for accurate measurements, resulting in accurate data collection every time with this DO meter.