🔍 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).