From economical and simple to robust and modular 

Thermo Scientific Orion dissolved oxygen benchtop and portable meters help you meet regulatory standards, enable quality control protocols are met, achieve your safety goals, and accelerate your path from challenge to solution.

Applications for dissolved oxygen measurement include:

  • Food and beverage
  • Pharmaceuticals
  • Energy and power
  • Education
  • Government
  • Water
  • Wastewater management

Thermo Scientific Orion DO instruments have the flexibility to use polargraphic and optical technology for DO measurement needs meeting regulatory requirements.

Learn more about the regulatory requirements the benchtop and portable meters can assist with.

International standards for regulatory compliance requirements: 






China MEP






EPA 150.1 4500-H+(B) D1293 (A,B) 10523 GB/T 6920 <791> 2.2.3 973.41 FDA - 21 CFR 114.90

pH of Soil/Solid Waste

SW-846 9040C & 9045D   D4972 10390 GB/T15555     994.16 - 994.18 USDA NRCS


EPA 120.1; SW-846 9050A 2510 (B) D1125 (A) 7888 n/a <645> 2.2.38 973.40 PSS-78 (salinity)

Dissolved Oxygen

  4500-O (G) D888 (B, C) 17289; 5814 HJ506        


  5210 (B)   5815 HJ505     973.44  


SW-846 9214 4500-F (C ) D1179 (B) 10359 GB7484        


  4500-NH3 (D, E)  D1426 (B) 6778          


Orion 601; SW-846 9210A 4500-NO3 (D)              


SW-846 9215 4500-S2 (G) D4658            


SW-846 9213 4500-CN (F) D2036 (A)            


SW-846 9212 4500-Cl (D) D512 (C)   GB11896        


SW-846 9211                
  SM: Standard Methods for the Examination of Water and Wastewater. APHA, AWWA, WEF.
  ASTM: American Society for the Testing and Materials
  ISO: International Organization for Standardization
  USP: United States Pharmacopeia
  EP: European Pharmacopeia
  China MEP: China Ministry of Environmental Protection
  AOAC: Association of Official Analytical Chemists
  NRCS: Natural Resources Conservation Service
  PSS-78: Practical Salinity Scale of 1978
  FDA: U.S. Food and Drug Administration
  USDA: United Stated Department of Agriculture

Available Dissolved Oxygen (DO) Meters


The accuracy and reliability of your measurements depends on the instrumentation you use. Learn more about how you can identify the best match based on your required features, performance, specifications and budget.


Our portable meters are rugged and waterproof, and provide the dependable performance in the field without sacrificing accuracy and reliability.

Thermo Scientific DO Meter Features

Ease-of-use with Orion multiparameter meters

Focused on

  • Large, easy-to-view displays help make recording measurements easier, faster and can help reduce documentation errors 
  • Onscreen instructions provide guidance on calibration and setup for more consistent operation with minimum training
Reliable electrochemistry measurements in the field

Provide Fast and Reliable Measurements

  • Selectable read modes and reading stability indicator capture and notify when measurements are ready 
  • Calibration information shown with measurements and selectable alarms help to ensure measurement integrity
Assist with compliance requirements

Assist with Compliance Requirements

  • Measure dissolved oxygen in percent saturation or mg/L with temperature
  • Perform DO calibrations using water-saturated air, air-saturated water, custom value (Winkler) or zero point
  • Select a meter with built-in barometer for automatic pressure compensated readings 

See our complete list of DO measurement offerings

Meter Accessories

find the right benchtop meter for your pH and ORP measurement needs

Enhance your productivity while protecting your investment. We offer an assortment of meter accessories for our benchtop and portable meters.

Electrodes and probes

Electrodes, probes, and sensors for use with conductivity meters

An extensive assortment of quality pH electrodes and sensors are available in a variety of body materials, body styles, fill types, reference styles, and junctions to meet the needs of your sample measurements.

Standards and solutions

Orion standards and solutions

We offer buffers, electrode storage solutions, electrode cleaning solutions, lab buffer kits, and electrode filling solutions for your measurement needs. Find the buffers and solutions that you need for your process.


Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.

Find your software