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.
Advantages of METTLER TOLEDO’s pH buffers
Get Accurate pH Readings
pH readings are only as accurate as the solutions used for calibration. Our comprehensive portfolio of pH calibration solutions satisfies every accuracy requirement. From technical buffers to pH buffers certified by an accredited body, we have the most suitable buffer for every application.
Minimize Contamination Risk
For high accuracy, uncontaminated buffers are of utmost importance. Our sachets ensure a fresh solution with the appropriate volume to perform a calibration directly in the sachet for maximum ease of use. 250mL bottles enable easy handling and reduce contamination risk in comparison to bulk containers.
Download Your Certificate of Analysis
A lot-specific certificate of analysis is available for every calibration solution, documenting accuracy and providing traceability to national metrology institutes for quality control. To support compliance with regulations, each SDS (Safety Data Sheet) and label contains information according to GHS (Globally Harmonized System) in local languages. Read more
Manage Your Sachet Stock
Thanks to the open magazines of the dispenser box, the number of remaining sachets can be easily determined, even from a distance. A reorder indicator helps to prevent running out of stock.
Certified by an ISO/17025 Accredited Lab
Our DAkkS certified pH buffers are verified by an independent, ISO 17025 accredited laboratory, providing confirmation of the pH value and associated uncertainty, making them a suitable choice for highly regulated industries.
Achieve Top Accuracy with NIST/DIN Buffers
NIST/DIN pH buffers are manufactured according to DIN/ISO 19266. They are specified to three decimal places, e.g. pH 9.180, offering a low uncertainty (± 0.015 pH).
A Complete System Provider
METTLER TOLEDO provides entire electrochemistry systems - from meters and sensors to calibration solutions and software. Benefit from automatic buffer recognition or temperature dependency tables for automatic accurate temperature compensation.
Useful Related Links
Application Specific Sensors
Accurate measurements start with the correct pH sensor. Our broad electrode portfolio complements the meter and solutions range and ensures that you have a perfectly suited sensor for every application. Read more
Reliable Meters
We offer a variety of durable benchtop and portable meters to meet your needs for compliance and routine measurements, including economical models for tight budgets. Read more
Good Electrochemistry Practice
Measuring pH in the laboratory is a common and important analysis. Good Electrochemistry Practice™ guides you through the entire product lifecycle to detect potential risks and find the right tools to address them. This helps to ensure that you achieve accuracy in all your critical pH measurements. Read more
Expert Application Support
Our pH Competence and Support Center offers easy access to dedicated application specialists for pH, ORP, ion, conductivity and DO measurements. They provide expert support, convey know-how and collaborate with product management to help ensure a high degree of success in all your critical electrochemical analyses. Read more
Meter and Sensor Accessories
Enhance and customize your measuring system with our range of effective pH accessories to simplify your workflow, reduce error risk and make it easier to obtain the accuracy you need. Each meter has interfaces that allow you to connect multiple pH accessories and peripherals such as printers and stirrers according to your application needs. Read more
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.
Support & Repair
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.