What is the meaning of As-Found & As-Left calibration?

As-found calibration

An as-found calibration is a calibration prior to repair or adjustment. This is often referred to when a flow meter has been sent back to the service office and it states the condition in which it is received. In comparison, there is also an as-left calibration. 

As-left calibration

As-left calibration is a calibration and adjustment after repair. It provides validation for repairs or adjustments.