Orion™ Star A123 2-in-1 (DO, Temperature) Portable Waterproof Meters

All Meters include 4 AA Batteries, Literature CD, Printed Quick Start Guide, and Meter Test Certificate. Please Note: Universal AC Adapter is sold separately.

Designed for intuitive, hassle-free operation, the Orion Star A123 accepts standard Thermo Scientific Orion polarographic DO probes and features automatic temperature compensation, manual salinity input, and manual barometric pressure adjustment. A large, high-contrast backlit screen clearly displays DO readings in both mg/L and % saturation alongside ambient temperature and battery status. With an ultra-efficient power management system delivering over 2,000 hours of continuous field operation on four AA batteries, the A123 ensures your mobile testing workflow remains uninterrupted.

Key Functional Benefits:

• Straightforward Operation & Navigation: Intuitive keypad layout with plain-language on-screen text prompts guides users through setup and multi-point calibration without consulting complex manuals
• Dual Volumetric Display Modes: Seamlessly toggles between mg/L concentration readings and % saturation alongside temperature in °C or °F
• AUTO-READ™ Stability Indicator: Automatically locks stable measurement values on-screen and alerts technicians when readings reach equilibrium to prevent early data recording
• Exceptional 2,000+ Hour Battery Life: Powered by 4 AA batteries providing an industry-leading 2,000+ hours of continuous field life—over double the operating time of higher-tier models
• Built-In Calibration Flexibility: Calibrate polarographic probes quickly using the water-saturated air method or perform custom calibrations aligned with Winkler titration procedures
• Internal Data Memory: Stores up to 50 data points with non-volatile memory to preserve critical readings even during battery replacements

Operational & Probe Maintenance Notes:

• Polarographic Probe Compatibility: Designed for use with Thermo Scientific Orion polarographic DO probes. Unlike the Star A223 and A323 models, the A123 does not support RDO optical luminescence probes
• Sensor Care: Polarographic sensors require periodic membrane cap replacement and electrolyte refilling. Regular maintenance ensures rapid response times and accurate calibration.