Vernier calipers measure which quantity?

Vernier calipers measure which quantity?

• A. Length
• B. Width
• C. Radius
• D. Actual wire diameter

Answer: (D)

Vernier calipers measure a straight-line distance between two opposing surfaces, giving a precise external dimension. When you measure a round wire, the distance across the wire—the space between the two jaws—is its diameter. The tool reads that cross-sectional width directly, so you obtain the actual wire diameter. The radius isn’t read directly (it would be half of that), and while calipers can measure other linear dimensions, the most direct quantity for a round wire is its diameter.

Vernier calipers measure a straight-line distance between two opposing surfaces, giving a precise external dimension. When you measure a round wire, the distance across the wire—the space between the two jaws—is its diameter. The tool reads that cross-sectional width directly, so you obtain the actual wire diameter. The radius isn’t read directly (it would be half of that), and while calipers can measure other linear dimensions, the most direct quantity for a round wire is its diameter.