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Thermo Scientific Orion Star™ A Series Portable Meters

The Orion Star™ A series offers a diverse line of newly designed single and multi-parameter instruments for a wide variety of applications. They incorporate features that will enhance your water quality monitoring and analysis programs.


Single Parameter Instruments

Orion Star A221 pH MeterOrion Star A222 Conductivity Meter
Orion Star™ A221 & Orion Star A222

Orion Star™ A221 pH Meter

  • Simultaneous measurement of pH and temperature

Orion Star™ A222 Conductivity Meter

  • Flexible direct and auto-calibration
  • Provides reliable conductivity, salinity, TDS, and temperature measurements

Orion Star™ A223 & A323
Dissolved Oxygen/RDO Meters

  • Salinity correction and automatic barometric compensation
  • Simultaneous display of DO and temperature readings

Call 1.800.833.7958


Orion Star A Series Specifications
Orion Star A221 Reference Guide
Orion Star A222 Reference Guide
Orion Star A223 & A323 Reference Guide

Dual Parameter Instruments

Orion Star A324 pH/ISE MeterOrion Star A325 pH/Conductivity Meter
Orion Star™ A324 & Orion Star™ A325

Orion Star™ A324 pH/ISE Meter

  • Simultaneous measurement of pH and ISE with temperature
  • Accepts ISFET (Ion Selective Field Effect Transistor) electrodes

Orion Star™ A325 pH/Conductivity Meter

  • Accepts ISFET (Ion Selective Field Effect Transistor) electrodes
  • Simultaneous display of pH, conductivity and temperature measurements
  • Reliable and accurate pH, conductivity, resistivity, salinity, TDS and temperature measurements for soil and water analysis applications

Orion Star™ A326 pH/Dissolved Oxygen/RDO Meter

  • Salinity correction and automatic barometric pressure compensation
  • Dissolved oxygen calibration to the Winkler Titration for BOD
  • Simultaneous display of pH, DO and temperature measurements

Call 1.800.833.7958


Orion Star A Series Specifications
Orion Star A324 Reference Guide
Orion Star A325 Reference Guide
Orion Star A326 Reference Guide

Multi-Parameter Instrument

Orion Star A329 Meter

Orion Star™ A329 Meter

  • pH, ISE, DO/RDO, and conductivity measurements in one waterproof, hand-held unit
  • Simultaneous display of pH or ISE, conductivity, DO and temperature measurements

Call 1.800.833.7958


Orion Star A Series Specifications
Orion Star A329 Reference Guide

Geotech Multi-Probe Flowblock Monitoring System

Geotech Multi-Probe Flowblock

The Geotech Multi-Probe Flowblock Monitoring System enables you to measure several parameters of a sample at the same time using up to 4 probe types.

The Geotech Flowblock can be used directly in-line with most groundwater pumping systems such as the Grundfos Redi-Flo2™, Geotech SS Geosub, Geotech Bladder Pump, or Geopump Peristaltic Pump, etc. Designed for minimal sample volume to reduce stirring dependence of sensors.

Call 1.800.833.7958


More Information

Geotech Flowblock with Thermo Orion Star Series RDO meter and probes installed.