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Thermo Scientific Orion Star A211 Benchtop pH Meter

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Record accurate and reliable pH, mV, ORP and temperature measurements. This meter is ideal for a wide range of applications and advanced pH analysis in the lab.

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Thermo Scientific Orion Star A211 Benchtop pH Meters are easy-to-use, dependable laboratory meters with advanced features and functions. Selectable read modes and stability indicator give you flexibility and control over your testing. All critical data is shown with your measurements including temperature, date and time, read type, measurement stability, active calibration information and electrode condition icon. Onscreen calibration and setup instructions can be displayed in several local languages with new languages added through software updates.
Navigation is fast and simple due to the comprehensive keypad with menu-specific function keys, dual purpose scroll/shortcut keys, plus power, measure, log view and stirrer keys that ensure easy operation. All setup menus are in one location with direct access using a single shortcut key so you can quickly access, evaluate and change measurement and instrument settings.

  • Measure pH, mV, relative mV or ORP with temperature
  • Perform up to a 5 point pH calibration using automatic buffer recognition of NIST or DIN buffer groups with choice to manually enter custom buffer values
  • Calibration editing option allows individual points to be fixed without a full recalibration
  • Informative, easy-to-read backlit graphic display with clear onscreen instructions simplifies operation
  • Capture your critical readings with measurement stability indicator and selectable read modes — Auto-Read holds a stable reading, Continuous shows changing readings with hold option and Timed logs data at specific intervals
  • Eliminate the need for magnetic stir bars using the meter-controlled stirrer probe (catalog number 096019) to uniformly mix solutions
  • Data log collects and date/time stamps up to 2000 measurement sets with optional sample ID and user ID
  • Calibration log stores 10 most recent calibrations
  • Non-volatile meter memory ensures your data and settings are protected, even with loss of power
  • Orion Star Com software facilitates data transfer to a computer via USB or RS232 connections
  • Flexible power options with universal power adapter or optional AA batteries
  • IP54-rated housing resists dust and splashes and can be wall-mounted if table space is limited
  • Meters include CE, TUV 3-in-1 and FCC Class A certifications


Accuracy (Temperature)±0.1°C
Accuracy (mV)±0.2 or ±0.05%, whichever is greater
Accuracy (pH)±0.002
Data Management DetailsTransfer single, range or all data points to printer or computer
DescriptionOrion Star A211 pH benchtop meter durable sensor TRIS kit with TRIS-compatible ROSS Ultra epoxy-body pH/ATC electrode
OutputsUSB, RS-232
IncludesStar A211 pH meter, 8157BNUMD ROSS Ultra epoxy-body pH/ATC electrode, 810199 pH buffer kit, electrode stand, 100-240V universal power adapter, computer cable
Measurement ModespH, mV, Relative mV, ORP with Temperature
CalibrationpH with calibration editing option, relative mV, ORP and temperature
Range (pH)-2 to 20
Resolution (pH)0.001, 0.01, 0.1
Range (mV)±2000.0
Range (ORP)±2000.0mV
Resolution (mV)0.1mV
Calibration Points1 to 5
Temperature Range (Metric)-5°C to +105°C
Temperature Range (English)22.0°F to 221.0°F
Resolution (Temperature)0.1°C, 0.1°F
Temperature SelectionManual or automatic with ATC temperature probe
Temperature Probe Calibration1 point temperature offset calibration
Display TypeLCD, Graphic with Backlight
Backlight OptionYes, selectable
MemoryNon-volatile memory preserves data log, calibration log and meter settings
Data Points2000 with Date and Time Stamp
Log Function TypeAutomatic with Auto-Read and Timed Read Modes, Manual with Continuous Read Mode
Alarm OutputHigh/low limit alarm, calibration due alarm
InputsBNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (ATC temperature probe), stirrer input (stirrer probe)
Certifications/ComplianceCE, TUV 3-1, FCC Class A
IP RatingIP-54
AC AdapterUniversal 50-60 Hz, 100-240 VAC power adapter (Cat. No. 1010003)
Dimensions (L x W x H)24 cm x 18 cm x 11 cm (9.5 in. x 7.1 in. x 4.3 in.)
Weight (Metric)0.9 kg
Weight (English)2 lb.
Warranty3 Year Meter Warranty
KeypadComprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Methods10 per channel with password protection
ModelOrion Star A211 pH/mV/RmV/ORP/Temperature Benchtop Meter
Power SupplyUniversal AC adapter (included) or 4 AA batteries (sold separately)
Probe TypepH electrode, ORP electrode, reference half-cell electrode, ATC temperature probe, stirrer probe (includes 8157BNUMD ROSS Ultra Triode pH/ATC electrode)
LanguagesEnglish, Spanish, French, Italian, German and Chinese; Portuguese and Korean Available with Software Update
Range (Relative mV)±2000.0mV
Relative Humidity Range5 to 85%, non-condensing
Isopotential Point7.000pH
StabilitySelectable fast, medium, slow or Smart Stability setting; Selectable off or Automatic Smart averaging setting
Temperature (English) Operating41°F to 113°F (ambient)
Temperature (Metric) Operating5°C to 45°C (ambient)
Battery Type4 x AA (sold separately)
Battery Life800 hr.
Unit SizeEach


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