Why is equipment calibration important?

Calibration, as defined by the International Vocabulary of Metrology (VIM), is: “The set of operations that establish, under specified conditions, the relationship between the values ​​of a quantity indicated by a measuring instrument or measurement system, values ​​represented by a materialized measure or a reference material, and the corresponding values ​​provided by standards” (source: VIM dictionary). In summary, it compares the reading value of an instrument against the value of a previously established standard.

In calibration, metrological traceability is a concept that is highly relevant and must be taken into account. According to ENAC, it consists of: “An uninterrupted and documented chain of calibrations to a reference (measurement standard, practical realization defining a unit of measurement, or a measurement procedure), using (documented) measurement procedures that allow relating the measurement results, generally to units of the International System (SI), legally established in Spain, with a known and documented measurement uncertainty” (source: ENAC).

Laboratories and entities have various instruments and process tools that are regularly calibrated. Factors such as aging of components, temperature and/or humidity conditions, or mechanical stress can gradually worsen the performance of measuring equipment. Any deviation or issue can lead to errors or problems in conducting tests and/or deviations from the required specifications.

The UNE-EN ISO/IEC 17025, an international accreditation ensuring technical competence, states that all equipment whose accuracy or measurement uncertainty affects the validity or metrological traceability of results must be calibrated. For this reason, laboratories must establish calibration programs. These programs should be reviewed and adjusted accordingly with one ultimate goal: maintaining confidence in the equipment. When performing calibration, the laboratory can do it:

  • Externally in an accredited laboratory or one that meets the requirements of NT74.
  • Internally by developing the part of the traceability chain under its responsibility.

In summary, periodic calibration of measuring and testing equipment is essential for:

Fine-tune your lab with our spreadsheets
for calibration and measurement

At GSC we know that the calibration of laboratory equipment is key to guaranteeing the quality of products and processes. For this reason, we offer you tools so that you can carry out calibration internally with all the required guarantees. This option, contemplated by the UNE-EN ISO/IEC 17025, allows the laboratory to minimise the economic resources that may be involved in the external calibration of its equipment, to know how the equipment measures and the uncertainty associated with its calibration. To this end, we provide you with these processes:
Calibration procedure which includes instructions on how to carry them out for each of your equipment specifically and instructions on how to calculate the uncertainty associated with the calibration.
Validated and protected calibration spreadsheets, which comply with the requirements of the UNE-EN ISO/IEC 17025 accreditation, where you can enter your internal calibration data for different equipment and perform all the calculations associated with it quickly and easily, so that you only have to worry about what is important, to be able to continue with your work as soon as possible.
In addition, our validated spreadsheets include:
Spreadsheet Validation Certificate
Explanatory Document on Spreadsheet Operation, if necessary
Extract from the calibration/control/measurement procedure for adaptation to the entity’s formats
What you are looking for, we have it! Please contact us in case you need a spreadsheet specifically for you.


  • Calibration of balances
  • Calibration of ovens, stoves, refrigerators, etc.
  • Calibration of both fixed and variable volumetric material 8655
  • Calibration of pH meters
  • Calibration of temperature equipment with repeated measurements
  • Control and maintenance of a UV-Visible instrument
  • Calibration of turbidimeter
  • Calibration of thermohygrometers (humidity)
  • Calibration of flowmeters


  • Direct measurement of sound level
  • Estimation of uncertainty in direct measurement
  • Measurement uncertainty in the verification of fuel dispensers and similar devices, and additive substances
  • Estimation of uncertainty for a reference value obtained by addition

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