ISO/IEC 17025:2017 accreditation ensures:

 The reliability of measurement results and calibration certificates.

 The environmental conditions and laboratory facilities for carrying out the calibrations.

The accuracy of the standard devices used in the calibrations.

The validity of calibration procedures and calculation of expanded uncertainty of measurement.

The traceability of measurement accuracy to National or International Standards, through an unbroken chain of successive calibrations.

The participation in Interlaboratory Comparisons.

 The Calibration & Measurement Capability studies (CMC), which is the lowest measurement uncertainty that a laboratory can achieve within its scope of accreditation