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A calibration certificate for an instrument states

  • A.only whether the instrument passed or failed its test
  • B.the price of the instrument and its date of purchase
  • C.the instrument's resolution and nothing further
  • D.the corrections found and the uncertainty of the calibration

Answer: D

Correct answer: the corrections found and the uncertainty of the calibration

A certificate is a measurement result, not a verdict. It records what the instrument read against the standard at each point, the correction implied, and the uncertainty of the calibration itself - because a calibration is a measurement and carries an uncertainty like any other. A bare pass or fail conveys none of that.

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