Calibration services for a wide range of gages, tools and standards, as well as field service, repairs and replacement instruments and parts should conform to NIST (National Institute of Standards and Technology) standards. A2LA (American Association for Laboratory Accreditation) accreditation is preferable.

Metrology, the "art of careful measurement", includes measurement services such as length metrology, electrical metrology, and quantum metrology. Metrology has been understood as the uniform methodology for measurements in natural science, covering methods for the consistent assessment of experimental data and rules regulating application in technology and in trade and industry.