🔍 Key Concepts
• How to read the main scale on an inch vernier caliper (whole inches and tenths of an inch)
• How the vernier scale adds the final thousandths of an inch by finding the best-aligned line
• The question is asking specifically for figure “D” in GS-0082, not A, B, C, etc.
💭 Think About
• On figure D, where does the zero mark of the vernier fall on the main scale? Is it between 1 and 2 inches, or 2 and 3 inches?
• Looking at figure D, which single vernier line lines up exactly with a line on the main scale, and what is that line’s number on the vernier?
• Once you know the main-scale reading and the vernier line number, how do you combine them to form a value like 1.815 or 2.820 inches?
✅ Before You Answer
• Be sure you are reading figure D only (bottom left circle) and not confusing it with similar positions in A, B, C, etc.
• Confirm the whole-inch value first (1 inch or 2 inches) by checking the last full inch mark to the left of the vernier zero.
• Verify the vernier least count (each division) so your added value is in thousandths of an inch, matching the answer choices (.815, .820, .115, .820).