• Portable Conductivity Meter

Portable Conductivity Meter

  • Conductivity, total dissolved solids, salinity, resistivity and temperature 
  • Perform up to a five point conductivity calibration

Record accurate and reliable conductivity, total dissolved solids (TDS), salinity, resistivity and temperature measurements with the Thermo Scientific Orion Star A222 Conductivity Portable Meter.

Ideal for a wide range of applications and advanced conductivity analysis in the field. Obtain temperature compensated readings using linear, non-linear or EP options with 15, 20 or 25 °C reference temperatures. Log up to 1000 data point sets with time / date stamp and transfer via USB or RS232 to a printer or computer. Waterproof meter ensures durable, rugged performance with an IP67-rated housing.

Don’t leave your measurements to chance when analyzing samples outside the lab. Orion Star A222 conductivity portable meters are designed to offer the reliability you need in a user-friendly package for your dedicated conductivity 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 conductivity, TDS, salinity or resistivity with temperature
  • Perform up to a five point conductivity calibration
  • Auto-ranging conductivity values offer consistent readings across entire measurement range without need to recalibrate
  • Use linear, non-linear or off conductivity temperature compensation with 15, 20 or 25°C reference temperatures
  • 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 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 and 3-year replacement warranty


Many configurations, electrodes, consumables and accessories available on request.

Range (Conductivity) 0.001 µS/cm to 3000 mS/cm
Resolution (Conductivity) 0.001 μS minimum, auto ranging up to 4 significant digits
Accuracy (Conductivity) 0.5% of reading ±1 digit > 3 μS; 0.5% of reading ±0.01 μS ≤ 3 μS
Range (TDS) 0.001 to 200.0 ppm
Resolution (TDS) 0.001 ppm minimum, auto ranging up to 4 significant digits
Accuracy (TDS) 0.5% of reading ±1 digit
TDS Factor Range Linear (0.02 to 9.99)
Range (Salinity) 0.06 to 80.00 psu, 0.05 to 42.00 ppt
Resolution (Salinity) 0.01 psu or 0.01 ppt minimum, auto ranging
Accuracy (Salinity) 0.5% of reading ±1 digit
Salinity Measurement Modes Practical salinity (psu)
Range (Resistivity) 2 ohm to 100.0 meg-ohm
Resolution (Resistivity) 1 ohm or 0.1 meg-ohm, auto ranging
Accuracy (Resistivity) 0.5% of reading ±1 digit
Compatible Probes 2-cell or 4-cell conductivity sensors with built-in temperature
Temperature Compensation Linear, nLFn (non-linear ultra pure water) or off
Temperature Reference 15, 20, 25°C
Calibration Conductivity and temperature
Calibration Points (Conductivity) Up to 5
Range (Temperature) -5.0° to 105.0° C, 22.0° to 221.0° F
Resolution (Temperature) 0.1°C, 0.1°F
Accuracy (Temperature) ±0.1°C
Temperature Selection Manual or automatic with ATC temperature probe
Temperature Probe Calibration 1 point temperature offset calibration
Channels 1
Display Type Graphic LCD with backlight
Backlight Option Yes, selectable
Keypad Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Measurement Modes Conductivity, TDS, salinity or resistivity with temperature
Stability Smart Stability and Smart Averaging
Data Management Details Transfer single, range or all data points to printer or computer
Data Points 1000 with date and time stamp
Log Function Type Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Memory Non-volatile memory preserves data log, calibration log and meter settings
Alarm Output Calibration due alarm (fixed 12 hour)
Methods 10 per channel with password protection
Languages English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Inputs 8 pin MiniDIN (conductivity sensor with built-in temperature)
Outputs USB, RS232
Probe Type Conductivity sensor (purchase separately)
Power Supply 4 AA batteries (included) or universal AC adapter (sold separately)
AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Battery Life 800 hours
Battery Type Four AA (included)
IP Rating IP-67
Certifications/Compliance CE, TUV 3-1, FCC Class A
Operating Temperature 41° to 113°F (ambient)
5° to 45° C (ambient)
Relative Humidity Range 5 to 85 %, non-condensing
Dimensions (L x W x H) 24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
Weight 1.2 lb.
0.5kg
Cell Constant 0.001 to 199.9cm-1
Warranty 3 year meter warranty