A211 pH Benchtop Meter

  • Durable and Dependable Ideal for every sample, every day for any water testing lab or application
  • Five Point Calibration Automatic recognition for USA/NIST and DIN buffers
  • Auto-Read Feature Locks in stable readings on screen
Product Options


Measuring pH, mV and temperature will never be a problem again when using the Thermo Scientific™ Orion Star™ A211 pH Benchtop Meter. This meter has been designed to be durable and dependable both in the lab and field. The A221 pH features up to five pH calibration with automatic recognition for USA/NIST™ and DIN buffers. Handily this meter has calibration editing for fixing calibration errors without the requirement for a complete calibration. Direct control of the Orion Star stirrer probe (096019, sold separately) is perfect for mixing samples without a stir plate.

AUTO-READ™ enables stable readings to be locked on the screen with the addition of the ready indicator alert which highlights when readings ares table and timed reading gathers data in specific time intervals. The non-volatile memory can hold up to 2000 data points with time and date stamping.

There are many standard features which make the Thermo Scientific™ Orion Star™ A211 pH Benchtop Meter the perfect instrument:

  • Provides computer connectivity, a USB port, and an electrode stand making it ideal for every sample, every day for any water testing lab or application
  • Simple screen prompts and soft keys that update for the ease of selection
  • Supports English, Spanish, French, German and Chinese
  • USB and RS232 ports and complimentary data analysis software to easily transfer data and keep meter software up-to-date
  • IP54 rated housing protects against splashes
  • Powering options - universal power adapter or four AA batteries
  • Electrode arm and newly designed probe holder make it easier to maintain and place probes into samples
  • Can be wall mounted to save bench space

Manufactured by: Thermo Scientific
Model: A211 pH Benchtop Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Accuracy (mV) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (pH) ±0.002pH
Battery Life 800 hours
Battery Type Four AA (sold separately)
Data Management Details 2000 point non-volatile memory; option to delete individual points, delete group of points or delete all
Data Points 2000
Description Orion Star A211 pH/mV/Temperature Benchtop Meter
Inputs BNC (pH), 8-pin Mini-DIN (temperature), reference pin-tip, stirrer input
IP Rating IP-54
Outputs USB, RS232
Configuration Details Star A211 pH Meter with Electrode Stand; Universal Power Adapter
Probe Type pH electrode, ATC probe, ORP electrode, reference electrode, stirrer probe - purchase separately
Range (mV) ±2000.0mV
Range (pH) -2.000 to 20.000pH
Relative Humidity Range 5 to 85 %, non-condensing
Resolution (mV) 0.1mV
Resolution (pH) 0.1, 0.01, 0.001pH
Temperature (English) Operating 41° to 113°F
Temperature (Metric) Operating 5 to 45°C
Accuracy (Temperature) ±0.1°C
Temperature Range (English) 23° to 221°F
Temperature Range (Metric) -5 to +105°C
Resolution (Temperature) 0.1°C
Range (Relative mV) ±2000.0 RmV
Calibration Points (pH) 1 to 5
AC Adapter Universal 90-260 VAC (included)
Display Type Graphic LCD with backlight
Log Function Type Manual, ready (includes AUTO-READ), timed
Item Description Benchtop Meter Only
Packaging Meter and stand only
Certifications/Compliance CE, TÃ???????????????V, FCC Class A limits