The process and objective evidence used to determine if the unit under test fulfills specified requirements. For example, ASTM and ISO standards define processes to be used for verification. If the measurement/calculation made using these defined processes, with a defined level of accuracy, is within the specified limits, the device is verified as conforming. Instron’s services are verifications to ASTM and/or ISO standards.

A common misconception is that calibration means adjusting the output of a device to bring its performance “within limits.” Any adjustment made to the output of the device is separate from the calibration and verification process, and must be followed by a further calibration and verification to prove the adjustment was successful.