The reading on the micrometer scale shown in figure "D" in the illustration is __________. Illustration GS-0081

Correct Answer: Option D — 0.4815 inch

Micrometer reading involves adding the sleeve reading (0.450) to the thimble graduation (0.0315). The thimble mark aligns with the horizontal datum line at 0.0315, resulting in a total measurement of 0.4815 inches. Precision measurement is critical for maintaining tolerances in engine room machinery and rotating equipment components.