Meet your pH and ORP sample analysis challenges in the lab or in the field

Whether you're looking for a simple pH meter on a budget, or a powerful pH meter that simultaneously measures other parameters, our pH meters are designed to help you tackle even the most complex pH measurements with confidence.

We offer simple, complete systems that are seamlessly integrated to help address your measurement needs both in the field and in the lab. Our benchtop pH meters are an ideal choice for dedicated pH testing in water, process, research, and QA/QC samples.

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

Available pH and ORP meters

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        


(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 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: US Food and Drug Administration
  USDA: US Department of Agriculture

Thermo Scientific pH & ORP meter features

Focused on ease of use

Ease-of-use with Orion multiparameter meters
  • Large, easy-to-view displays help make recording measurements easier and faster, and can help reduce documentation errors 
  • Onscreen instructions provide guidance on calibration and setup for more consistent operation with minimum training

Provide fast and reliable measurements

Reliable electrochemistry measurements in the field
  • 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 pH, mV, relative mV, or ORP with temperature
  • Perform pH calibrations with automatic buffer recognition of NIST or DIN buffers and manual buffer value entry options
  • View up to 0.001 pH resolution, perform up to a six point calibration and record key calibration data including slope
See our complete list of pH and ORP 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 & Probes

view our selection of electrodes

A variety of tip styles, junctions, body types, references, and connectors to support any application.

Buffers & Solutions

view our buffer and solutions

We offer buffers, electrode storage solutions, electrode cleaning solutions, lab buffer kits, and electrode filling solutions for your measurement needs.


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