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Thermo Scientific™ Orion Star™ A221 Portable pH Meter

CAD 1,949.01

Record accurate and reliable pH, mV, ORP and temperature measurements with the Thermo Scientific™ Orion Star™ A221 Portable pH Meter. This meter is ideal for a wide range of applications and advanced pH analysis in the field.

Special order item. Please call (250.868.3186) or message us using the inquiry form below.

Sorry, this product is either sold out or not sold online. But we are likely to still have stock left in one of our warehouses. Please fill out the inquiry form below to contact our sales team - we will do our best to source the product for you.

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Record accurate and reliable pH, mV, ORP and temperature measurements with the Thermo Scientific™ Orion Star™ A221 Portable pH Meter. This meter is ideal for a wide range of applications and advanced pH analysis in the field. Perform up to a 5-point pH calibration, log up to 1000 data point sets with time/date stamp and easily transfer calibration and data logs via USB or RS232 to a printer or computer with free downloadable Orion Star™ Com software. Waterproof meter ensures durable, rugged performance in outdoor environments with an IP67-rated housing.

Don’t leave your measurements to chance when analyzing samples outside the lab. Orion Star A221 Portable pH Meters are designed to offer the reliability you need in a user-friendly package for your dedicated pH testing needs. This waterproof, portable meter displays critical data with your measurement including temperature, date and time, read type, measurement stability, active calibration info and power source status.
  • 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
  • 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 and Continuous shows changing readings with hold option
  • Data log collects and date/time stamps up to 1000 measurement sets
  • 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 AA batteries or optional universal power adapter
  • IP67-rated housing is waterproof for rugged field operation
  • Meter kits include hard-sided field case and protective meter armor with electrode holders, adjustable wrist/belt strap and built-in meter stand.
  • Meters offer CE, TUV 3-in-1 and FCC Class A certifications.


AC AdapterUniversal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
OutputsUSB, RS-232
Accuracy (mV)±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (pH)±0.002
Alarm OutputCalibration due alarm (fixed 12 hour)
Backlight OptionYes, selectable
Battery Life800 hr.
Battery Type4 x AA
CalibrationpH, relative mV (RmV), ORP and temperature
Calibration Points1 to 5
Certifications/ComplianceCE, TUV 3-1, FCC Class A
Data Management DetailsTransfer single, range or all data points to printer or computer
Data Points1000 with date and time stamp
DescriptionOrion Star A221 pH portable meter kit with ROSS Ultra Triode low maintenance gel pH/ATC electrode, solutions, meter armor and field case
Display TypeLCD Graphic, Backlit
IP RatingIP 67
Measurement ModespH, mV, Relative mV, ORP with Temperature
Range (mV)±2000.0 mV
Range (pH)-2 to 20
Resolution (pH)0.1/0.01/0.001
Temperature Range (Metric)-5.0°C to +105.0°C
IncludesStar A221 pH meter, 8107UWMMD ROSS Ultra gel-filled epoxy-body pH/ATC electrode with 3m cable, pH 4/7/10 buffer and rinse pouches, ROSS storage solution, protective meter armor, hard-sided carrying case, 4 AA batteries, computer cable
InputsBNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (ATC temperature probe)
Isopotential Point7.000pH
KeypadComprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
LanguagesEnglish, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Log Function TypeAutomatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
MemoryNon-volatile memory preserves data log, calibration log and meter settings
Methods10 per channel with password protection
ModelOrion Star A221 pH/mV/RmV/ORP/Temperature Portable Meter
Power Supply4 AA batteries (included) or universal AC adapter (sold separately)
Probe TypepH electrode, ORP electrode, reference half-cell electrode, ATC temperature probe (includes 8107UWMMD ROSS Ultra Triode pH/ATC electrode)
Range (ORP)±2000.0 mV
Range (Relative mV)±2000.0 mV
Relative Humidity Range5 to 85%, non-condensing
Resolution (mV)0.1mV
StabilitySmart Stability and Smart Averaging
Temperature Accuracy±0.1°C
Temperature (English) Operating41°F to 113°F (ambient)
Temperature (Metric) Operating5°C to 45°C (ambient)
Temperature Probe Calibration1 point temperature offset calibration
Temperature Range (English)22.0°F to 221.0° F
Temperature Resolution0.1°C, 0.1°F
Temperature SelectionManual or automatic with ATC temperature probe
Warranty3 Year Meter
Dimensions (L x W x H)24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
Weight (English)1.2 lb.
Weight (Metric)0.5 kg
Unit SizeEach

We’re a supplier to the commercial winery, brewery, cidery & distillery industries across Canada & North America. Please fill in the form below to contact our in-house sales consultants. We’ll get back to you within 1-2 working days.

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