pH electrodes must be calibrated regularly in order to adjust the slope and zero point (offset) to standard values (pH buffers). Manumesure offers a wide range of pH buffers suitable for all applications.

• NIST/DIN standard buffer solutions

pH 1.68 4.01 7.00 9.18 10.01
These buffer solutions are formulated to NIST (National Institute of Standards and Technology, USA) and DIN19266 specifications.
The solutions are supplied with a quality certificate containing the following information: pH value and uncertainty, traceability, batch number and expiry date. Packaged in ready-to-use 125-mL bottles, these buffers can be kept for 2 or 3 months after opening. Accurate to ± 0.02 pH and traceable to certified reference materials, these standard solutions guarantee maximum accuracy and link your measurements to the international system.

• COFRAC-certified buffer solutions

To meet your needs, MANUMESURE offers a range of calibration solutions with pH values of 4.005 ± 0.008; 6.865 ± 0.013 and 9.180 ± 0.050 traceable to international standards.
Our pH-certified reference materials are produced in compliance with NIST/IUPAC recommendations and in accordance with DIN 19266.
The property value is directly traceable to the primary pH standards produced by LNE.
Our accreditation as a producer of reference materials ensures that only pH buffers with a shelf life, uncertainty and traceability to the S.I. recognised by COFRAC are used.

• Concentrated buffer solutions
  

pH 4.00 7.00 9.00

Concentrated pH 7.00 and 9.00 buffer solutions are supplied in 125 mL bottles and must be diluted 10 times before use. This will give you 1.25 L of calibration solution after dilution. Note that the pH 4.00 buffer must be diluted 5 times before use (0.625 L of solution after dilution).
The colour coding of the three solutions will make them easier to use and reduce the risk of confusion between acidic, basic and neutral buffers.

• Redox buffer solutions

These calibration solutions are used to adjust the instrument/electrode combination to the value of the standard solution. The redox sensor must be calibrated regularly to ensure the best possible accuracy. Manumesure offers two ready-to-use standard solutions (220 mV and 468 mV) and a concentrated solution (146 mV Michaelis Solution). All three solutions are supplied with a quality certificate.

• Conductivity standard solutions
  

Conductivity standards 147 µS/cm and 1408 µS/cm
These solutions are controlled and standardised using a conductivity meter calibrated with a certified solution traceable to NIST reference materials. They are supplied with a quality certificate containing the following information: conductivity value and uncertainty, traceability, batch number and expiry date.
Conductivity standard 12.85 mS/cm
This standard solution is controlled and standardised using a conductivity meter calibrated to an OIML (Organisation Internationale de Métrologie Légale) standard. The solution is delivered with a quality certificate containing the following information: conductivity value and uncertainty, traceability, batch number and expiry date.
Conductivity standard 12.88 mS/cm
This is a concentrated solution of 1mol/L KCl diluted to 1/10th in pure water to obtain a conductivity standard solution of 12.88 mS/cm (at 25°C). Different conductivity values can be obtained depending on the dilution ratio.
All vials are labelled with the batch number and expiry date.

• Manumesure proposes a complete range of calibration solutions for measuring pH, redox potential and conductivity. With the aim of meeting your needs as closely as possible, the range comprises certified standard solutions which can be traced to the SI units system.
• pH and redox buffer solutions
• Standard conductivity solutions
• Complete range of standard solutions containing reference materials traceable to and compliant with NIST/DIN

To fully meet your expectations, a range of accessories is available that is compatible with your equipment. Feel free to add them to your quote request to obtain a complete and tailored solution.