TM 9-243READING A VERNIER MICROMETERReading the vernier micrometer is the same as readingthe standard micrometer. An additional step must betaken, to add the vernier reading to the dimensions. Thisallows for precise measurements which are accurate toten-thousandths (0.0001) of an inch. This scale fur-nishes the fine readings between the lines on the thim-ble rather than making an estimate as you would on astandard micrometer.The ten spaces on the vernier (1) are equivalent to 9spaces on the thimble (2). Therefore, each unit on thevernier scale is equal to 0.0009 inch and the differencebetween the sizes of the units on each scale is 0.0001inch.TO READ A MEASUREMENT AS SHOWN ABOVE:Read highest figurevisible on barrel (3). . . . . . . . . . . . . . .Number of lines visiblebetween the No. 2 andthimble edge (4). . . . . . . . . . . . . . . . .The line on the thimblethat coincides with oris nearest the2 = 0.200 in.3 = 0.075 in.revolution or long linein the barrel (5) . . . . . . . . . . . . . . . 11 = 0.011 in.The line on the vernierscale that coincideswith the line on thethimble (6) . . . . . . . . . . . . . . . . . . . . . . .2 = 0.0002 in.TOTAL= .2862 in.7-5
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