🔍 Key Concepts

• Identify the last fully visible number on the micrometer sleeve scale to get the base reading in thousandths of an inch. • Determine which thimble graduation lines up exactly with the horizontal reference line on the sleeve to find the additional thousandths. • Remember that on a 0–1 inch micrometer, each numbered division on the sleeve is one‑tenth of an inch (0.100 in), and each thimble division is 0.001 in.

💭 Think About

• On figure A, what is the highest sleeve number you can still see completely to the left of the thimble edge? Convert that to inches. • Looking carefully at the thimble in figure A, which graduation (between 15 and 20) is exactly aligned with the reference line on the sleeve? How many thousandths of an inch does that add? • After you find the sleeve value and the thimble value, when you add them together, which choice most closely matches your sum?

✅ Before You Answer

• Be sure you are not counting any sleeve mark that is partially covered by the thimble. • Confirm you are using the correct value per division: 0.100 in for each large numbered sleeve division and 0.001 in per thimble division. • After adding sleeve and thimble readings, check that your final answer is between 0.900 and 1.000 inch, matching what you see on the main scale.