General
pH value	4,005
Deviation	± 0,008
Temperature condition	25 °C

This product is a COFRAC-certified set of pH buffer solutions from manufacturer Chauvin Arnoux, consisting of a total of 15 single-use vials, each 25 ml. The solutions are available in three pH values: 4.005, 6.865, and 9.180, with five vials per value. These buffer solutions serve as reference material for the calibration, qualification, and testing of pH measuring devices, ensuring accurate and traceable measurements. Calibration enables compensation for electrode aging and damage, and ensures traceability of measurement results.

Applications
The pH buffer solutions are intended for regular and cost-effective calibration of pH measuring devices in laboratory and industrial applications. They are particularly suitable for testing and fine-tuning pH meters, as well as for validating other pH buffer solutions. The use of single-use vials prevents cross-contamination and guarantees a fresh solution for each calibration.

Functions and Equipment in Detail
The solutions are accredited as reference material according to standards NF EN ISO 17034 and ISO Guide 34, and are directly traceable to primary calibration standards of the French testing laboratory LNE. Certification is provided by the French accreditation committee COFRAC under number 1-5650. The pH values are defined at a temperature of 25 °C, with deviations of ± 0.008 at pH 4.005, ± 0.013 at pH 6.865, and ± 0.050 at pH 9.180. The vials are color-coded to prevent confusion between acidic, neutral, and basic solutions.

Technology Explained Simply
Traceability of measurement results is ensured through direct linkage to international calibration standards. The buffer solutions are manufactured according to recommendations from NIST, IUPAC, and DIN standard 19266. COFRAC certification guarantees that the solutions may be used within their shelf life with recognized uncertainties. The solutions are packaged in 25-ml vials, each containing a single dose.

Compatibility and Accessories
The buffer solutions are designed for calibrating pH measuring devices that use measuring electrodes. They are not intended for calibrating redox buffer solutions or other measurement methods. The solutions are used directly from the vial, with no additional accessories required.

Mounting and Installation
The solutions are delivered in single-use vials, which are inserted directly into the measuring device. No mounting or installation is required. The vials are designed for easy opening and use.

Operational Advantages
The use of COFRAC-certified buffer solutions ensures high measurement accuracy and traceability. Single-use vials prevent contamination and enable simple, clean handling. The color-coding of the vials reduces the risk of errors due to misidentification of pH values. Shelf life is 36 months before opening for pH 4.005, and 12 months for pH 6.865 and 9.180. After opening, the solutions remain usable for several months, depending on storage conditions.

The product is delivered as a set of 15 vials, five for each pH value (4.005, 6.865, 9.180), in 25-ml packaging. The vials are COFRAC-certified, confirming the quality and traceability of the solutions.