What does Section 22 require before any surveying instrument can be used?

• A. Instrument calibration and registration
• B. Only instrument calibration
• C. Only registration
• D. Regular maintenance checks

Answer: (A)

The requirement being tested is that a surveying instrument must be both calibrated and registered before use. Calibration checks ensure the instrument’s readings are accurate against known standards and that any needed adjustments are made so measurements are trustworthy. Registration creates an official record linking the instrument to its owner, the date, and the calibration status, which supports traceability and accountability. Section 22 of DAO 2007-29 mandates these two steps together to prevent measurement errors and to maintain proper documentation. Regular maintenance checks are important for ongoing reliability, but they do not fulfill the specific pre-use condition required by Section 22, which is the combination of calibration and registration.