During calibration, what is the action immediately after turning on the display?

• A. Turn on the display
• B. Press the zero button
• C. Close the jaws
• D. Check the zero reading

Answer: (C)

Establishing a zero reference is what calibration hinges on. After you turn on the display, you bring the measuring jaws together to their fully closed position. This creates a known reference point by eliminating any gap or preload in the measuring path, so the device can read zero accurately when the jaws are closed. Once that closed position is reached, you typically set the zero reading (so future measurements start from true zero) and then verify that the reading remains at zero with the jaws closed. If you don’t close the jaws first, the zero reading will reflect the current gap, which can bias all subsequent measurements.