What elements should a calibration/maintenance log include?

• A. Only the calibration date.
• B. Instrument ID, calibration date, method, standards, results, maintenance actions, responsible person, and next due date.
• C. Maintenance dates only.
• D. User passwords and access logs.

Answer: (B)

The main idea is keeping a complete, traceable record of every calibration and maintenance event so you can verify an instrument’s accuracy, track its history, and plan future checks. The best log entry includes the instrument’s identity, when the calibration happened, the method used, the reference standards, the results, any maintenance actions taken, who was responsible, and when the next calibration is due. Each item serves a purpose: the instrument ID ties the record to that device; the calibration date and next due date establish the schedule; the method shows how the calibration was performed; the standards indicate what references the results rely on; the results reveal whether the instrument met acceptance criteria; maintenance actions document repairs or adjustments; the responsible person provides accountability.

Why the other options fall short: a log that only lists the calibration date lacks traceability and planning for future checks; maintenance dates alone don’t show calibration history or outcomes; maintenance dates without calibration details miss the verification of instrument accuracy; including passwords and access logs is unrelated to calibration history and raises security concerns.