Laboratory pH Buffer

pH Buffers for Calibration to Ensure Compliance and Traceability

A pH buffer is a reference solution of known pH value that is used for sensor calibration. pH buffers are key to ensuring accurate pH readings. Select from our comprehensive range of accurate pH calibration solutions, from technical buffers, buffers certified by an accredited body (DAkkS), to NIST/DIN buffers for high precision. To minimize contamination risk, choose small bottles or single-use sachets.

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Buffer Certificates
Buffer Certificates and Safety Data Sheets
Buffer Certificates and Safety Data Sheets

Download quality control certificates and Safety Data Sheets for METTLER TOLEDO buffers, electrolytes, and conductivity standards to ensure maximum traceability.

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FAQs

What is the difference between technical, NIST/DIN and certified pH buffer solutions?

  • Technical pH buffers:
    This pH buffer solution comes with a certificate from METTLER TOLEDO. Precision is ± 0.02 pH units.
  • NIST/DIN pH 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 ± 0.015 pH units.
  • Certified pH buffers:
    Selection of pH buffers that are verified and certified by a DAkkS (Deutsche Akkreditierungsstelle, German Accreditation Body) accredited laboratory. Precision is ± 0.02 pH units.

 

What are the tolerances of METTLER TOLEDO pH buffers?

  • DIN/NIST pH buffers ± 0.015 pH units
  • Certified (DAkkS) pH buffers ± 0.02 pH units
  • Technical pH buffers ± 0.02 pH units

 

*The tolerances are only for the buffer and not for the entire pH measurement of a sample.

 

I want to use fresh buffers in small quantities. Do you offer this option?

We offer buffer sachets (small volume packaging of 20mL) that are easy to use and guarantee fresh solutions for every calibration. Each sachet box comes with a printed certificate.

 

Should I stir the pH buffer when performing a calibration?

When measuring the pH value of a sample, gently stir the sample to ensure that it is homogeneous. It is important that calibration and measurement are done under the same conditions.