This Thermo Scientific Orion Star A321 pH/mV/Temperature Portable Meter is used for taking advanced measurements on location. It is rugged and dependable, making it ideal for every sample, every day, everywhere. Get the information you need quickly and easily from the large, backlit graphic LCD display. Informative display shows pH/mV/RmV and temperature along with electrode status, time, date, sample ID, user ID and calibration points. Advanced features such as stability and averaging options provide additional options allowing for laboratory accuracy everywhere you need it. Meter is easy to use with its plain language screen prompts, soft keys that update for easy selection and a multilanguage interface that supports English, Spanish, French, Italian, German and Chinese. The AUTO-READ™ locks in the stable reading on your screen, ready indicator alerts when readings are stable, and timed reading gathers data in specific time intervals. Up to 5 point pH calibration with automatic recognition for USA/NIST and DIN buffers. Fix errors without a complete recalibration with calibration editing. Non-volatile memory holds up to 5000 data points with time and date stamp. Easily transfer data and keep meter software up-to-date with the USB and RS232 ports and complimentary data analysis software. Four AA batteries (included) provide over 800 hours of operation or purchase the universal power adapter (sold separately) to use AC power. Perfectly portable, waterproof and protected to take anywhere with an IP67-rated housing. 3 year meter replacement warranty. pH Range: -2.00 to 20.000. pH Resolution: 0.1, 0.01, 0.001. pH Relative Accuracy: ±0.002. pH Calibration Points: Up to 5. Calibration Editing: Yes. mV/RmV Range: ±2000.0. mV/RmV Resolution: 0.1. mV/RmV Relative Accuracy: ±0.2mV or ±0.05% of reading, whichever is greater. mV/RmV Standard Oxidation- Reduction Potential ORP Mode: Yes. Temperature Range: -5 to 105°C, 23 to 221°F. Temperature Resolution: 0.1. Temperature Relative Accuracy: ±0.1. Temperature Offset Calibration: 1 Point. Datalogging Number of Points: 2000 With Time And Date Stamp. Datalogging Log Function: Manual, Ready (Includes AUTO-READ™), Timed. Datalogging Log Edit: Delete Individual Points, Group Of Points, Or All. Inputs pH Electrode: BNC, Reference Pin. Inputs ATC Probe: 8-pin mini-DIN. AC Adapter: Optional– Universal, 100 – 240VAC. Battery Power: Included, 4 AAs. Battery Life: 800hrs. Thermo Scientific Orion #: STARA3210.