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ASVAB · Measuring and Marking

A micrometer is used to measure dimensions with greater accuracy than a standard ruler. What is a micrometer's typical precision?

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Correct answer

1/1000 inch (0.001 inch or 0.01 mm)

  1. A 1/16 inch
  2. B 1/1000 inch (0.001 inch or 0.01 mm)
  3. C 1/100 inch
  4. D 1/2 inch

Why this is the answer

A micrometer (screw gauge) measures to 0.001 inch (one thousandth of an inch) or 0.01 mm precision — far more accurate than a standard ruler (1/16 inch) or even a digital caliper (0.001 inch for some models). Micrometers are used in precision machining, engine work, and anywhere exact dimension verification is required. The thimble scale and sleeve scale are read together to obtain the measurement.
Source: ASVAB SI, Precision Measuring

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About this topic: Measuring and Marking

Measuring and marking questions cover rulers, tape measures, calipers, micrometers, squares and levels, including reading fractions of an inch and checking that something is square, level or plumb. This is one of 10 Shop Information questions on measuring and marking, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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