Why is micrometer measurement more precise than a dial caliper, and what typical accuracy is expected?

• A. Dial calipers are more precise than micrometers.
• B. Micrometers have no moving parts and are less precise.
• C. Typical accuracy is around ±0.05 mm.
• D. Micrometers use a fine screw mechanism with smaller pitch; typical accuracy around ±0.01 mm to ±0.02 mm.

Answer: (D)

Micrometers are more precise because of their fine screw mechanism and how the scale is read. The spindle moves only a tiny amount with each turn of the screw, and the thimble is divided into many small parts, giving a reading increment of about 0.01 mm. That combination lets you detect very small changes and achieve typical accuracies around ±0.01 mm to ±0.02 mm.

Dial calipers use a slider and a dial or scale with larger increments, so their readings are less fine and their overall accuracy is generally worse—often around ±0.02 mm to ±0.05 mm. So the micrometer’s finer pitch and higher-resolution readout explain why it’s more precise and why its typical accuracy is in the ±0.01 to ±0.02 mm range.