Thermo OrionĀ® Star A321 pH Portable Meters

  • Large, backlit graphic LCD 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 available.
  • AUTO-READ™ locks in the stable reading, 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 2000 data points with time and date stamp.
  • Waterproof. IP67-rated housing.
  • Log function: manual, ready (includes AUTO-READ™), timed. Log edit: delete individual points, group of points or all.
  • Multilingual interface supports English, Spanish, French, Italian, German and Chinese.
  • Inputs: (pH electrode) BNC, reference pin; (ATC probe) 8-pin mini-DIN.
  • Output: RS232 and USB.
  • Power: 4 x AA batteries (included) provide over 800 hours of operation, or use the AC adapter (sold separately) for 100-240V.
  • Warranty: 3 year meter replacement.


  • pH range: -2.000 to 20.000 ±0.002.
  • mV/RmV range: ±2000.0mV ±0.2m or ±0.05% of reading, whichever is greater. EH ORP mode.
  • Temperature range: -5.0 to 105.0°C (23 to 221°F) ±0.1. Offset calibration: 1 point.

Manufacturer : Thermo Orion Inc

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Cat.#DescriptionIncludesMfg.#PriceQuantityEstimated Availability
639-417-02Star A321 pH Portable MeterFour AA batteriesSTARA3210$1,578.15 EA  
Ships within one week
639-417-04Star A321 pH Portable Meter KitROSS Triode 3-in-1 pH/ATC probe, pH buffer pouches (4.01, 7.00 and 10.01), ROSS electrode storage solution (475ml), rinse solution pouches, protective armor with electrode holder, hard carrying case and four AA batteriesSTARA3215$2,714.42 EA  
Ships within one week

Parts & Accessories:

Cat.#DescriptionMfg.#PriceQuantityEstimated Availability
639-890-30Hard carrying case for A-series portable metersSTARA-CS$298.10 EA  
Ships from stock
639-890-32Armor for Orion Star A-series portable meters, includes electrode holders for pH, conductivity and DO probesSTARA-AR$215.68 EA  
Ships within one week
639-890-33pH electrode holder for Star A-series armorSTARA-ESPH$60.15 EA  
Ships within one week
639-890-34Conductivity and DO prove holder for Star A-series metersSTARA-ESCD$60.15 EA  
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639-890-35AC adapter, 120V1010003$140.10 EA  
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639-890-36Orion ROSS Ultra Low Maintenance pH/ATC Triode Combination Electrodes with a BNC and 8-pin MiniDIN Connector and 3 meter cable8107UWMMD$1,106.46 EA  
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639-890-37pH 4.01 buffer pouches910410$73.82 PK / 10  
Ships within one week
639-890-38pH 7.00 buffer pouches910710$73.82 PK / 10  
Ships within one week
639-890-39pH 10.01 buffer pouches911010$73.82 PK / 10  
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639-890-40pH rinse solution pouches911110$73.30 PK / 10  
Ships within one week

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