Verniers are often a bit more complicated because they read more than one extra digit. This very common type of shop Vernier caliper has two scales, one for inches and one for millimeters. The inch scale has numbered marks every 1/10”, and four sub-divisions between each, for a total of 40 divisions per inch (giving a spacing of 0.025” per division). The small Vernier scale has 25 divisions in the space of 24 on the main scale. First you look at the main scale to get within the nearest 0.025”, then you find the best-aligned Vernier mark and add up to 0.024” more to read to the nearest 0.001” (1/1000”).
The metric scale has a division every 1mm on the main scale, and the Vernier scale has 50 divisions in the space of 49 on the main scale. First you read to the nearest 1mm on the main scale, then you find the best-aligned Vernier mark to get within 0.02mm (1/50mm).
Location: Box 2
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