A measuring instrument dropped, what should be done to make it useful again?

Question

the measuring instrument is a very precise reading instrument. If it dropped then, the accuracy and the precision might not be true anymore. How to fixed it?

Answer 1

Calibrate it using another same instrument or an object of known proportions.

Answer 2

Repair the mechanical properties, and then recalibrate.

Answer 3

You send it for caliration.