Which instrument is used to measure the width, depth or length of small objects by placing the object inside?

Which instrument is used to measure the width, depth or length of small objects by placing the object inside?

• A. Callipers
• B. Metre Rule
• C. Trundle Wheel
• D. Clinometer

Answer: (A)

Calipers let you measure small dimensions accurately by placing the object between the jaws of the instrument. The external jaws measure width or overall external length, while the internal jaws handle inside dimensions like a bore or hollow, and a depth probe extends from the end to measure depth. This combination makes calipers ideal for the width, depth, or length of small objects, especially when precision is important. A metre rule is better for longer items but lacks fine precision; a trundle wheel measures distance rolled on the ground; a clinometer measures slope or angle, not physical dimensions.

Calipers let you measure small dimensions accurately by placing the object between the jaws of the instrument. The external jaws measure width or overall external length, while the internal jaws handle inside dimensions like a bore or hollow, and a depth probe extends from the end to measure depth. This combination makes calipers ideal for the width, depth, or length of small objects, especially when precision is important. A metre rule is better for longer items but lacks fine precision; a trundle wheel measures distance rolled on the ground; a clinometer measures slope or angle, not physical dimensions.