Get high accuracy, premium performance and ultimate flexibility with the Thermo Scientific™ Orion™ Versa Star Pro™ Benchtop Meter with Dissolved Oxygen/RDO Module. Meet your most challenging applications for dissolved oxygen and temperature. Easily view measurements on the stunning color display and customize the four meter channels with interchangeable modules. Use an RDO optical or polarographic DO probe and calibrate using water-saturated air, air-saturated water, custom value (Winkler) or zero point. Log up to 2000 data point sets with time/date stamp and transfer to a printer or computer.