Which tool is used to measure movement?

Which tool is used to measure movement?

• A. Dial Indicator
• B. Caliper
• C. Micrometer
• D. Ruler

Answer: (A)

Measuring movement requires sensing tiny changes in position, not just a fixed size. A dial indicator is built to do exactly that: a stylus touches the part, and any shift in position causes the internal mechanism to rotate the dial, giving a readout of displacement. This makes it ideal for checking how much a surface or component moves, how much a shaft runs out, or how much a machine table might deflect, all within very small increments (often thousandths of an inch or hundredths of a millimeter). The reading is directly tied to movement, providing a sensitive, repeatable measure of displacement. Calipers and micrometers are great for static dimensions—outer or inner distances and thicknesses—but they don’t track motion the way a dial indicator does. A ruler offers only rough measurements and lacks the precision needed for small movements. So for measuring movement, the dial indicator is the best tool.

Measuring movement requires sensing tiny changes in position, not just a fixed size. A dial indicator is built to do exactly that: a stylus touches the part, and any shift in position causes the internal mechanism to rotate the dial, giving a readout of displacement. This makes it ideal for checking how much a surface or component moves, how much a shaft runs out, or how much a machine table might deflect, all within very small increments (often thousandths of an inch or hundredths of a millimeter). The reading is directly tied to movement, providing a sensitive, repeatable measure of displacement.

Calipers and micrometers are great for static dimensions—outer or inner distances and thicknesses—but they don’t track motion the way a dial indicator does. A ruler offers only rough measurements and lacks the precision needed for small movements. So for measuring movement, the dial indicator is the best tool.