What must match between the standard block and the gauge?

• A. Manufacturing date
• B. Serial numbers
• C. Color
• D. Weight

Answer: (B)

In this kind of testing, measurements must be traceable to a known standard. The standard block is a fixed reference with a unique serial number that ties it to a specific calibration record. The gauge used to check that block also has a serial number, and those two numbers should match so you know the gauge has been calibrated against the same standard block. This linkage ensures the measurements are accurate and comparable over time, because you’re not mixing references from different calibration lots. Other details like color, manufacture date, or weight don’t establish that calibration linkage.