Calibration validity guidance

In past times, re-calibration periods used to be stated exactly for each type of instrument, which tended to result in over or under calibration.

Re-calibration periods compliant with ISO17025 are more nuanced, and as described in ILAC-G24, can take into account a variety of factors such as:

  • Your country of operation. For example, in Australia, NATA continues to issue formal guidelines on the traceable metrological validity period, for each type of instrument. NIST in the USA seems to have another view
  • Equipment specifications and history, application and environmental factors.
  • Typically, a manufacturer's recommended re-calibration period may be used as a first-off guide.
  • Mention of a re-calibration period on an ISO 17025 compliant calibration certificate, or instrument label, is specifically rejected.

Calibration validity is stated on our product brochures and is commonly 3 years. However, as stated above, the user should determine what is appropriate for their organisation. 

For customers genuinely interested in demonstrating traceable calibration, this long calibration validity can result in real lifetime cost savings, since the expense and inconvenience of a number of calibration cycles can be avoided.


Calibration Service