Corrected instrument by device repairman

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After an instrument has been corrected by a qualified device repairman, it can be returned to service once the correction has been verified and the instrument is re-checked to ensure it meets the required accuracy. This verification usually involves re-calibration or inspection to confirm performance is within spec, and proper documentation is updated. The key idea is that repair and correction restore usability, not that the instrument must be kept out of service or only used under special conditions. The other options imply ongoing disqualification or bias, which isn’t how corrected instruments are handled—once corrected and verified, they may be used according to standard procedures.