COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Micrometer use. Engineer's hand using a micrometer to measure the width of a component of a water pump. Micrometers are highly-accurate tools which can allow measurements accurate to within one thousandth of a centimetre. They are used when great precision is required, for instance in parts that have to fit together snugly.
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