A metal tape which contains diameter graduations along the tape is wrapped aroud the groove in asheave.this tape has space apart supports which precisely position the tape at acertain depth in the groove.When the two ends of the tape intersects,there we find the diameter of the groove and it has a vernier graduation.
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petrol is measured in centimetres
No, volume is measured in cubic units, area is measured in square units.
The length of a house can be measured in dekameters.
your finger nail can be measured in millimeters
measured with a graduated cylinder