State any four applications of micrometers. 
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It is used to measure the teeth of gears accurately.  This instrument is used to check round work pieces accurately  It is also used to check wall thickness of the pipes  It is used to check depth or height of the work piece  It is used to measure groves keyways etc  It is used to check inside bore of the work piece accurately  It is used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects.
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