The waterproof, battery-operated Thermo Orion Star A123 portable DO meter stands up to the most demanding field applications and delivers over 2,000 hours of continuous operation. Multiple calibration options, automatic temperature compensation, and manual salinity and barometric pressure compensation make the A123 user-friendly and accurate.

The rugged, user-friendly meter displays DO concentration, DO saturation and temperature readings on a large LCD screen, while icons provide quick updates on battery life, electrode status and calibration information. Simple button layout and on-screen messages assist with calibration and explain setup menu choices.