Which of the devices shown in the illustration is designed for both inside and outside measurements? GS-0073
Official USCG Answer & Rule Citation
Correct Answer: Option B — C
The vernier caliper (C) is a versatile precision instrument designed to measure both internal and external dimensions. Its dual-jaw configuration allows for the measurement of hole diameters and outer diameters, making it an indispensable tool for verifying tolerances in marine machinery components and piping systems.
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