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

 
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Value
Certification
Accuracy
Packaging type
Packaging size
Material No.: 30258811
ValuepH 1.68 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 30258823
ValuepH 5.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 30258827
ValuepH 8.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350058
ValuepH 10.012 ;
CertificationMETTLER TOLEDO ;
AccuracyHigh (± 0.015 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350052
ValuepH 4.006 ;
CertificationMETTLER TOLEDO ;
AccuracyHigh (± 0.015 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350054
ValuepH 6.865 ;
CertificationMETTLER TOLEDO ;
AccuracyHigh (± 0.015 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350056
ValuepH 9.18 ;
CertificationMETTLER TOLEDO ;
AccuracyHigh (± 0.015 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056126
ValuepH 10.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size10 L ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056129
ValuepH 10.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056117
ValuepH 2.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056118
ValuepH 4.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size10 L ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056121
ValuepH 4.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056122
ValuepH 7.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size10 L ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 63056125
ValuepH 7.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size500 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302068
ValuepH 4.01/7.00/9.21 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size3x 10x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302080
ValuepH 4.01/7.00/10.01 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size3x 10x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302079
ValuepH 10.01 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size30x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302069
ValuepH 4.01 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size30x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302047
ValuepH 7.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size30x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51302070
ValuepH 9.21 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typesachets ;
Packaging size30x 20 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350012
ValuepH 11.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350006
ValuepH 7.00 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350008
ValuepH 9.21 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Material No.: 51350022
ValuepH 9.21 ;
CertificationMETTLER TOLEDO ;
AccuracyStandard (± 0.02 pH) ;
Packaging typebottle ;
Packaging size6x 250 mL ;
ParameterpH ;
Purposecalibration/verification ;
Comparison

Documentation

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

800 METTLER (800 638 8537)
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.

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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.
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