What is the inspector's responsibility in maintaining equipment calibration?

• A. Calibrate once at project start.
• B. Keep testing equipment calibrated per schedule, record calibration data, and use certified equipment.
• C. Calibration is done by the contractor.
• D. Replace equipment only when broken.

Answer: (B)

Ongoing calibration of testing equipment is essential. Equipment can drift over time due to wear, temperature changes, and repeated use, so keeping it calibrated on a regular schedule protects the accuracy of all measurements throughout the project. Recording calibration data creates a traceable history that verifies tests were performed with known, validated accuracy, which is crucial for quality control and for resolving any discrepancies. Using equipment that has current certified status ensures the devices themselves meet the required standards and that their measurements are trustworthy and compliant with specifications.

If calibration were done only at the start, drift could go unnoticed and test results might become unreliable. If the inspector relied on the contractor to handle calibration, there would be less direct control over measurement quality and documentation. Replacing equipment only when it’s broken ignores gradual drift that can degrade accuracy before a failure is obvious.

So, the best practice is to maintain calibration on a schedule, document the calibration data, and use certified equipment.