Who is typically responsible for recalibrating instruments?

• A. External customers
• B. Employer and trained personnel
• C. Government inspectors
• D. End users

Answer: (B)

Calibration is a maintenance and quality control task that ensures instruments read correctly against known standards. It is typically handled by the employer and trained personnel because they own the equipment, follow established calibration procedures, use traceable reference standards, and keep the required records to prove accuracy over time. External customers may rely on calibrated instruments but don’t usually perform recalibration, and government inspectors verify compliance rather than carry out routine recalibration. End users operate the instruments but generally aren’t trained or authorized to adjust or recalibrate, which could compromise accuracy and traceability. So the best answer is the employer and trained personnel who maintain calibration as part of the organization’s quality program.