ORP Buffers for Verification - Traceable to SRM NIST

ORP Buffers

Buffer Solutions for Verification Purposes

Test Certificates

To guarantee maximum traceability, a global test certificate exists for all redox buffers. Contact your METTLER TOLEDO representative to acquire the test certificate.

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.



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


pH Sensors

The complete InLab sensor portfolio covers the whole scope of OPR 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



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.

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Analytical Instruments

Products and Specs

Products and Specs
Material No.: 51350060
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Material No.: 51350062
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Material No.: 51350064
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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 measureme...

Safety Data Sheets (SDS) and certificates


What is an ORP buffer used for?

ORP buffer solutions are used for verification of all common redox sensors. They are not used for calibration purposes. Similar to other solutions, an ORP buffer is temperature dependent. It is therefore important to know the measurement temperature of the ORP buffer. A table on every bottle label indicates redox values at different temperatures.

Where can I obtain a certificate for my ORP Buffer?

All METTLER TOLEDO ORP buffer solutions are available in handy bottles with no-fuss labels. If larger quantities are required, then our 6-packs are the right choice. To guarantee maximum traceability, a global test certificate exists for all redox buffers. Furthermore, compliance with regulations is key for us. All SDS (Safety Data Sheet) and labels contain information according to GHS (Globally Harmonized System) in local languages.

If you need a document to verify the certificated production of these ORP buffers, please contact your dealer or local METTLER TOLEDO representative, whom you will find in the contact section at www.mt.com.

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