Which instrument is used to measure inside dimensions with high precision?

Which instrument is used to measure inside dimensions with high precision?

• A. Outside calipers
• B. Inside calipers
• C. Dial indicator
• D. Tape measure

Answer: (B)

Measuring inside dimensions with high precision requires a tool that fits inside the space and defines the exact gap between the interior surfaces. Inside calipers accomplish this by having legs that reach across the bore or hole and contact the inner walls. The distance between the legs represents the internal diameter, which you can read directly or transfer to a micrometer or dial caliper for a precise value. This makes them ideal for internal measurements. Outside calipers measure external dimensions, a tape measure is too imprecise for tight tolerances, and a dial indicator checks displacement or variation rather than providing the direct internal dimension.

Measuring inside dimensions with high precision requires a tool that fits inside the space and defines the exact gap between the interior surfaces. Inside calipers accomplish this by having legs that reach across the bore or hole and contact the inner walls. The distance between the legs represents the internal diameter, which you can read directly or transfer to a micrometer or dial caliper for a precise value. This makes them ideal for internal measurements. Outside calipers measure external dimensions, a tape measure is too imprecise for tight tolerances, and a dial indicator checks displacement or variation rather than providing the direct internal dimension.