Thermo Orion Star A122 Portable Conductivity Meter

The Thermo Orion Star A122 portable conductivity meter combines simplicity and accuracy for both lab and field conductivity readings.


  • Displays conductivity and TDS readings using Orion 8-pin mini-DIN electrodes
  • AUTO-READ function alerts user and locks on-screen readings when stable
  • IP67 waterproof rating, 3-year warranty
List Price $756.00
Starting At $718.20
Stock Drop Ships From Manufacturer  
Thermo Orion Star A122 Portable Conductivity Meter

The Thermo Orion Star A122 portable conductivity meter is waterproof and battery-operated. The Thermo Orion Star A122 stands up to the most demanding field applications and delivers over 2,000 hours of continuous operation. The meter can be calibrated manually or automatically using Thermo conductivity standards to make the setup process easy.

The rugged, user-friendly meter displays conductivity, TDS and temperature readings on a large LCD screen, while icons provide quick updates on battery life, electrode status and calibration information. Simple button layout and on-screen messages simplify calibration and explain setup menu choices.


  • AUTO-READ function to alert the user and lock on-screen readings when stable
  • Selectable cell constant
  • Selectable reading reference temperatures of 20 C or 25 C to increase accuracy
  • Non-volatile memory holds up to 50 data points
  • Electrode arm and newly-designed probe holder to place probes into samples
  • Universal power supply or battery power option
  • IP67-rated housing (may be immersed for up to one hour with no water incursion)
  • 3-year meter warranty


  • Conductivity
  • Range: 0.1 uS/cm to 200 mS/cm
  • Resolution: Min 0.01 uS or 3 significant figures
  • Relative Accuracy: 0.5% reading +/-1 digit
  • Reference: 20, 25 C (default)
  • Compensation: Linear (0.0 to 10.0 %/C)
  • Compatible Cell Constants: 0.0001 to 10
  • Number of Calibration Points: 1
  • TDS
  • Range: 1 to 19,999 mg/L
  • Resolution: 4 significant figures
  • Relative Accuracy: 0.5% reading +/-1 digit
  • TDS Factor Range: Linear 0.01 to 10.00, default 0.49
  • Temperature
  • Range: -5 to 105 C
  • Resolution: 0.1
  • Relative Accuracy: +/-0.1 C
  • Offset Calibration: Yes
  • Datalogging
  • Number of Points: 50
  • Log Function: Manual, Automatic with AUTO-READ
  • Log Edit: Delete last reading or all
  • General
  • Display: Custom LCD
  • Inputs: 8-pin mini-DIN
  • Power Adapter: Universal AC, 100-240 VAC
  • Battery Power: 4 AAs, 2000 hrs life
  • Environmental Requirements: 5 to 45 C and 5 to 85% relative humidity, non-condensing
  • Regulatory and Safety: CE, TUV 3-1, FCC Class A
  • IP Rating: IP67, splashproof and dustproof
  • Warranty: 36 months (from date of purchase)
Questions & Answers
Does the Star A112 Benchtop Meter have better accuracy than the A122 portable meter?
No, both meters feature the same accuracy for all measurements. They feature the same battery life and optional power supply as well. The main difference is the waterproof rating as the portable A122 meter has a higher rating of IP67.
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Part #
Thermo Orion Star A122 Portable Conductivity Meter
Orion Star A122 Conductivity Portable Meter
Your Price $718.20
Drop Ships From Manufacturer  
Thermo Orion Star A122 Portable Conductivity Meter Kit
Orion Star A122 Conductivity Portable Meter Kit
Drop Ships From Manufacturer  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Choosing The Right Thermo Portable For Your Project

With so many options in Thermo Scientific’s Orion Star A line, it can be difficult to narrow down which meter will best fulfill a project’s needs. One easy way to rule out some meters is by considering application type. For projects that rely largely on collecting samples in the field, a portable meter is clearly the way to go. But there’s still a handful of meters to choose from. To simplify making the right choice, we spoke with Ricki Hartwell, the global product manager for Thermo Scientific’s Orion Laboratory and Field Instruments. She recently shared her tips on choosing the right Thermo benchtop. Let’s take a look at her recommendations for selecting the right portable meter.

Read More

What is Conductivity?

UPDATE : Fondriest Environmental is offering their expertise in conductivity through their new online knowledge base. This resource provides an updated and comprehensive look at conductivity and why it is important to water quality. To learn more, check out: Conductivity, Salinity and TDS. Salinity and conductivity  measure the water's ability to conduct electricity, which provides a measure of what is dissolved in water. In the SWMP data, a higher conductivity value indicates that there are more chemicals dissolved in the water. Conductivity measures the water's ability to conduct electricity. It is the opposite of resistance. Pure, distilled water is a poor conductor of electricity.

Read More

Building Reliable Systems: Hydroelectric Dam Monitoring in Western Pennsylvania

Hydroelectric dams are a source of renewable energy, and many have taken the place of fossil fuel reliance across the United States. While they provide green energy to the grid, they also impact the environment above and below the dam. In order to protect these habitats and mitigate any potential harm, hydroelectric dam operators monitor water quality conditions above and below the dam to ensure conditions meet ecosystem needs. Eagle Creek Renewable Energy has several hydroelectric plants positioned throughout Pennsylvania, and each is managed and monitored by a team of professionals. One of these managers is Craig Goldinger, a regional manager with Eagle Creek Renewable Energy in Western Pennsylvania.

Read More