pH Buffers for Calibration to Ensure Compliance and Traceability

pH Buffer

Quality pH Buffers to Match your Needs

Test Certificates

To guarantee maximum traceability, an individual test certificate exists for every batch of buffer solutions. It can easily be downloaded and printed for documentation purposes.

Download your certificate here

Compliance with GHS

Remaining compliant with regulations is important. All of our SDS (Safety Data Sheet) and labels contain information according to GHS (Global Harmonized System) in local languages.

Download your SDS here
 

Discard Expired Buffer

The expiry date indicates until which date the certificate guarantees the value and the associated measurement uncertainty. After this date the uncertainty cannot be guaranteed.

Fresh Buffer

Use a fresh aliquot of buffer for each calibration to ensure no contamination enters the bottle. Do not calibrate directly in the solution bottle.

Correct Quantity

Use enough buffer for accurate calibrations. The sensor should be submerged in the solution in order to achieve the most accurate results.

 

Meters

pH Meters

To fit your electrochemistry system needs, we offer a variety of benchtop and portable meters that are professional and durable. Our portfolio offers products designed for compliance, routine measurements or anyone working on a tight budget.

Benchtop MetersPortable Meters

Sensors

pH Sensors

The complete InLab® sensor portfolio covers the whole scope of pH applications. These range from routine measurements to specialist applications. To find your perfect match, visit our Sensor Product Guide today for an interactive way to the right sensor

Sensor Product Guide

Service

Service

We offer different service packages depending on your needs. These range from professional on-site installation and configuration to documented proof of compliancy. If full coverage beyond initial warranty is desired, we offer an extended care package in the form of preventive maintenance and repair.

More about Service
 
Analytical Instruments

Products and Specs

 
Products and Specs
Filter:
Set filter
Clear All
 
Value
Certification
Accuracy
Packaging type
Material No.: 51350002
See details
ValuepH 2.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350016
See details
ValuepH 2.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 30111134
See details
ValuepH 2.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51350004
See details
ValuepH 4.01
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350018
See details
ValuepH 4.01
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51302069
See details
ValuepH 4.01
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51350006
See details
ValuepH 7.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350020
See details
ValuepH 7.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51302047
See details
ValuepH 7.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51350008
See details
ValuepH 9.21
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350022
See details
ValuepH 9.21
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51302070
See details
ValuepH 9.21
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51350010
See details
ValuepH 10.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350024
See details
ValuepH 10.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51302079
See details
ValuepH 10.01
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51350012
See details
ValuepH 11.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350026
See details
ValuepH 11.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 30111135
See details
ValuepH 11.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51302068
See details
ValuepH 4.01/7.00/9.21
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 51302080
See details
ValuepH 4.01/7.00/10.01
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typesachets
Material No.: 30095312
See details
ValuepH 4.01/7.00/9.21
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 30095313
See details
ValuepH 4.01/7.00/10.00
CertificationMETTLER TOLEDO
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350052
See details
ValuepH 4.006
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typebottle
Material No.: 30111136
See details
ValuepH 4.006
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typesachets
Material No.: 51350054
See details
ValuepH 6.865
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typebottle
Material No.: 30111137
See details
ValuepH 6.865
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typesachets
Material No.: 51350056
See details
ValuepH 9.18
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typebottle
Material No.: 30111138
See details
ValuepH 9.18
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typesachets
Material No.: 51350058
See details
ValuepH 10.012
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typebottle
Material No.: 30111139
See details
ValuepH 10.012
CertificationMETTLER TOLEDO
AccuracyHigh (± 0.015 pH)
Packaging typesachets
Material No.: 51350032
See details
ValuepH 4.01
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350042
See details
ValuepH 4.01
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350034
See details
ValuepH 7.00
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350044
See details
ValuepH 7.00
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350036
See details
ValuepH 9.21
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350046
See details
ValuepH 9.21
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350038
See details
ValuepH 10.00
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Material No.: 51350048
See details
ValuepH 10.00
CertificationDKD
AccuracyStandard (± 0.02 pH)
Packaging typebottle
Comparison

Documentation

Product Brochures

Solutions for Calibration & Care
The determination of pH, conductivity, ion concentration, redox potential and dissolved oxygen are common analyses in most laboratories. The measure...

Competence

pH buffer accuracy
The accuracy of pH buffers is essential for a proper calibration, and hence to assure the reliability and quality of pH measurements. A comparison stu...

Safety Data Sheets (SDS) and certificates

Services

+41 44 944 47 47
Call Service

Explore our Services - Tailored to Fit your Equipment

We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.

Performance
Maintenance & Optimization
Expertise
Training & Consulting

FAQ

How can I optimize the use of my pH buffers?

The quality of a solution is only guaranteed for unopened bottles that have not yet expired. The following tips will help optimize the use of pH buffer solutions after opening and while in use in the laboratory. Fresh calibration solutions minimize the measurement uncertainty and thus optimize the reproducibility of results:

  • Note the date on the bottle when the pH buffer is opened for the first time.
  • Keep the bottles sealed tightly at all times
  • Never pour dispensed pH buffer solution back into the original bottle.
  • Ensure that bottles containing are not contaminated.
  • Replace pH buffer solutions that have reached the expiry date or may be contaminated.

Where can a certificate or a material safety data sheet for solutions be obtained?

The certificates of all calibration solutions and many electrolytes can be downloaded at www.mt.com/buffer. The respective material safety datasheets are available at the same place.

What is the difference between Technical, NIST/DIN and Certified pH buffer solutions?

  • Technical buffers:
    This pH buffer solutions come with a certificate from METTLER TOLEDO. Precision is ± 0.02 pH units.
  • NIST/DIN buffers:
    Buffers prepared according to the recommendation of the National Institute of Standards and Technology (NIST) and the German Institute for Standardization (DIN). They also have a certificate from METTLER TOLEDO. Precision is ± 0.02 pH units.
  • Certified buffers:
    Selection of  pH buffers that are verified and certified by an independent laboratory (DKD = Deutscher Kalibrierdienst = German Calibration Service). Precision is ± 0.02 pH units.

What are the tolerances of our pH buffers?

  • DIN/NIST pH buffers ± 0.02 pH units
  • DKD buffers ± 0.02 pH units
  • Technical buffers ± 0.02 pH units

What calibration points should I use?

Calibration should cover the range of the desired measurement values. The most common pH sensor calibration method is two-point calibration.

Should pH buffer 7.00 be included in every calibration?

It is not necessary to include pH 7.00 for calibration according to the US and European pharmacopoeia (USP and EP, respectively). But if the calibration is done in compliance with the Japanese Pharmacopoeia (JP), then pH 6.86 buffer (phosphate) is mandatory. For calibration according to EP, only pH buffer 4.01 (phthalate) is compulsory.

If not working according to any regulation, the principle is easy: For calibration, only those buffers are needed which bracket the pH range of your samples. For example in a quality control where every sample should have pH between 3.5 and 3.8, a 2-point calibration with pH 2.00 and 4.01 is sufficient. There is no need for calibration with pH 7.00 in such a case.

Are all pH calibration buffers from METTLER TOLEDO NIST compliant?

All of our pH buffers are NIST traceable and hence NIST compliant. Please read the following citation of our calibration certificate:

  • For the calibration of the pH value of our buffer solutions, the measuring instruments were calibrated using two different reference buffer solutions, based on primary pH reference materials of the NIST1.
  • The National Metrology Institutes compare their measurement capabilities periodically in key comparisons within the CIPM-MRA2.
  • The international comparability, harmonization and the equivalence of their measurement capabilities are therefore guaranteed.
  • This ensures a flawless traceability of the certified pH buffer solution values to NIST along with our Quality Management System. The certification is done for each lot.
Join the GEP eLearning Program
Know the Risk of Your pH Measurement
Ion Selective Electrode Guide – Theory and Practice
pH Theorie Guide
How to Measure pH in Small Samples
pH Toolbox for Life Sciences
Thank you for visiting www.mt.com. We have tried to optimize your experience while on the site, but we noticed that you are using an older version of a web browser. We would like to let you know that some features on the site may not be available or may not work as nicely as they would on a newer browser version. If you would like to take full advantage of the site, please update your web browser to help improve your experience while browsing www.mt.com.