Thermo Scientific Orion STAR A211 Digital Benchtop pH Meter with Electrodes and Stand

The Thermo Scientific Orion STAR A211 Digital Benchtop pH Meter is a laboratory analytical instrument designed for accurate and reliable pH measurement in liquid samples. Manufactured by Thermo Scientific, the Orion STAR A211 is part of the Orion STAR series of electrochemical measurement instruments and is suitable for research laboratories, pharmaceutical facilities, educational institutions, environmental testing laboratories, and industrial quality-control departments.

The Orion STAR A211 is designed to provide dependable pH measurements through an intuitive digital interface and advanced measurement technology. It features a large LCD display that presents measurement readings and instrument operating information. Its user-friendly keypad allows laboratory personnel to access measurement, calibration, setup, data logging, and other instrument functions.

The instrument is primarily designed for measuring the acidity and alkalinity of liquid samples. It is suitable for routine laboratory analysis involving water, chemical solutions, prepared buffers, pharmaceutical formulations, and other compatible samples. Its digital measurement system provides clear readings and helps reduce the subjectivity associated with traditional indicator-based pH testing.

The Orion STAR A211 supports pH and millivolt measurements, making it useful for different electrochemical laboratory applications. It is designed to work with compatible pH electrodes and temperature probes. The electrode detects the electrochemical response of a sample and transmits the signal to the meter, which processes and displays the corresponding measurement.

An important feature of the Orion STAR A211 is its multi-point calibration capability. The instrument supports up to five-point pH calibration, allowing users to calibrate the meter using suitable standard buffer solutions. Multi-point calibration helps maintain measurement reliability across different pH ranges and is particularly useful when laboratories analyse samples with varying acidity and alkalinity.

The meter also supports automatic buffer recognition and selectable buffer groups. These functions help simplify calibration procedures and assist users in selecting appropriate calibration values. Temperature compensation is available to account for temperature-related effects during pH measurement when used with a compatible temperature probe.

The instrument includes data management capabilities for laboratory measurement records. Its data logging and measurement storage functions help users review recorded measurements and maintain information for laboratory testing activities. Depending on the configuration, compatible accessories and software can also support data transfer and documentation.

The supplied electrode accessories shown in the photograph include a Thermo Scientific pH electrode, an additional Orion electrode, connecting cables, and an electrode stand. These accessories allow the meter to be configured for different laboratory measurement requirements, subject to electrode compatibility and condition.

The electrode stand provides convenient positioning of the electrode during sample testing. It helps keep the probe stable and allows laboratory personnel to lower the electrode into sample containers without continuously holding it manually. The power adapter provides the required electrical supply for operating the instrument.

The Orion STAR A211 is suitable for applications in pharmaceutical research, chemical analysis, water quality testing, food and beverage laboratories, biotechnology research, and educational laboratory experiments. It can be used for monitoring pH during solution preparation, quality-control testing, chemical reactions, and routine analytical procedures.

Its combination of a digital display, multi-point calibration, temperature compensation, electrode compatibility, and data management features makes it a practical instrument for laboratories requiring reliable electrochemical measurements.

The pictured unit is supplied with the accessories visible in the photographs. Buyers should confirm the working condition of the meter, electrode response, calibration performance, cable connections, and completeness of the supplied accessories before purchase.

1. Pharmaceutical Laboratories – pH testing of pharmaceutical formulations, solutions, and laboratory preparations.
2. Chemical Laboratories – Measurement of acidity and alkalinity in chemical solutions and reagents.
3. Water Quality Testing – Analysis of drinking water, wastewater, purified water, and laboratory water samples.
4. Food and Beverage Industry – pH analysis of food ingredients, beverages, and liquid products.
5. Biotechnology Research – Monitoring pH during biological experiments and research procedures.
6. Microbiology Laboratories – Measuring pH of culture media, buffers, and microbial growth solutions.
7. Environmental Laboratories – Testing environmental water samples and monitoring acidity levels.
8. Research and Development – Supporting scientific experiments involving electrochemical measurements.
9. Educational Institutions – Practical demonstrations of pH measurement, calibration, and analytical chemistry.
10. Industrial Quality Control – Routine pH monitoring of process solutions and industrial liquid samples.
    • Thermo Scientific Orion STAR A211 benchtop pH meter.
    • Advanced digital pH measurement technology.
    • Large LCD display with user-friendly keypad.
    • pH measurement range of -2.000 to 20.000.
    • Supports pH, mV, relative mV, ORP, and temperature measurements.
    • Up to five-point pH calibration.
    • Automatic buffer recognition.
    • Selectable pH buffer groups.
    • Automatic and manual temperature compensation.
    • Temperature probe calibration.
    • Measurement stability selection.
    • AUTO-READ measurement function.
    • Continuous and timed measurement modes.
    • Data logging capacity of up to 2,000 measurement records.
    • Date and time-stamped measurement records.
    • Calibration history storage.
    • USB and RS-232 connectivity.
    • Compatible with different pH and ORP electrodes.
    • Electrode stand for convenient probe positioning.
    • Universal AC power adapter.
    • IP54-rated meter housing.
    • Non-volatile memory for retaining measurement records and settings.
      

      Specification	Details
      Brand	Thermo Scientific
      Product Series	Orion STAR
      Model	A211
      Equipment Type	Digital Benchtop pH Meter
      Measurement Parameters	pH, mV, Relative mV, ORP, Temperature
      pH Range	-2.000 to 20.000
      pH Resolution	0.1, 0.01, 0.001
      pH Accuracy	±0.002
      Calibration Points	Up to 5
      mV Range	±2000.0 mV
      mV Resolution	0.1 mV
      mV Accuracy	±0.2 mV or ±0.05% of reading
      Temperature Range	-5°C to 105°C
      Temperature Resolution	0.1°C
      Temperature Accuracy	±0.1°C
      Temperature Compensation	Automatic / Manual
      Data Logging	Up to 2,000 records
      Calibration Memory	10 most recent calibrations
      Display	Digital LCD
      pH Electrode Input	BNC with reference pin
      ATC Probe Input	8-pin Mini-DIN
      Communication	USB and RS-232
      Power Supply	Universal AC adapter, 100–240 VAC
      Optional Battery Operation	4 AA batteries
      Protection Rating	IP54
      Electrode Stand	Included as pictured
      Accessories	Electrodes, cables and power adapter as pictured

      Specifications sourced from Thermo Scientific product documentation.

      Condition: To be confirmed (Used / Refurbished / Brand New).

      The Thermo Scientific Orion STAR A211 pH Meter is offered with the accessories visible in the product photographs. The supplied configuration includes the digital meter, electrode accessories, electrode stand, connecting cables, and power adapter.

      The operational condition, electrode performance, calibration status, display functionality, and completeness of accessories should be verified before purchase.