What is calibration needed for?

Calibration determines the actual accuracy of a balance, which can be used to assess its usefulness and technical condition.

The direct reason for the use of calibration is the requirements of quality systems such as ISO.

The PN-EN ISO 9001 February 2009 standard says that:

7.6 Where it is necessary to ensure reliable results, measuring equipment should be calibrated and/or checked at specified intervals or before use against measurement standards linked to international or national measurement standards.