🔍 Key Concepts
• How to read the sleeve (barrel) scale on an inch micrometer (each numbered division usually equals 0.100 inch, and each short line 0.025 inch).
• How to read the thimble scale (each division usually equals 0.001 inch).
• Adding the sleeve reading and thimble reading together to get the total micrometer measurement.
💭 Think About
• First, look at figure H and decide what the last fully visible major graduation on the sleeve is to the left of the thimble edge. About what range (0.1, 0.2, 0.3, 0.4 inch, etc.) does that put you in?
• Next, count any additional 0.025-inch sleeve lines that are clearly past the reference edge, then add that to your major graduation value.
• Finally, find which thimble line lines up exactly with the horizontal sleeve line and convert that into thousandths of an inch, then add it to your sleeve total. Which answer choice is closest to that sum?.
✅ Before You Answer
• Be sure you are only counting sleeve graduations that are fully exposed to the left of the thimble edge; do not include any partially covered line.
• Confirm that the aligned thimble line is read correctly (don’t mix up 0.010, 0.015, 0.020, etc.).
• After adding sleeve and thimble readings, verify that your result matches the correct range suggested by the sleeve (this helps you rule out any answer that is off by a tenth of an inch).