Vernier and a ruler called Fixed scale unit, mm, the slide move called vernier used to catch the phase of the measured material and use your eyes look to match the line compared to read out the value 1 10. Millimeter (mm) 0.1
.Micrometer is a measure that is very detailed. Rotating the screw to capture material to measure, then use the eye compared to take measure out to 1 100 part of mm (0.01 mm) or some types may have to 1 the 1000 mm. (0.001 mm)
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