
How does the scale of an
imperial micrometer work?












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Measurements provided by a micrometer are made up of a combination of values taken from the sleeve scale, the thimble scale and, on some micrometers, the vernier scale. 









Micrometer sleeve scale





The sleeve scale of an imperial micrometer has a measuring range of 1 inch.
It is divided into increments of 0.025 inches and is numbered every 0.1 inches. 









Micrometer thimble scale





The thimble scale has a measuring range of 0.025 inches (the smallest value that can be measured on the sleeve scale).
It is divided into 25 numbered increments, with each increment representing 0.001 inches (0.025 ÷ 25= 0.001). 









Micrometer vernier scale





Some also have a vernier scale on the sleeve, which provides the user with readings of even greater accuracy (up to 0.0001 inches).
The vernier scale has a range of 0.001 inches and is graduated in 10 numbered increments, each of which represents 0.0001 inches. 





