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The only way to check whether a tool has been calibrated is to review a calibration record, certificate or label to confirm that the most recent successful calibration was done recently enough.

To check that a tool is IN calibration, use it to measure an item where the characteristic being measured is already known with high precision and confidence (called a standard). If the measurement result is close enough to the known value, then the tool is in calibration.

Sometimes you might want to confirm or check the calibration by checking several standards with widely varying sizes or amounts.

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Q: How do you check if a tool has been calibrated?
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