The precision of measuring devices can be increased with the use of a vernier scale, a small movable scale placed next to the main scale of the instrument, named after its inventor, Pierre Vernier $(1580-1637).$ ?It allows precise measurement of a fraction $($usually one$-$tenth or one$-$twentieth$)$ ?of the smallest division on the main scale. See a more detailed discussion at Wikipedia Vernier Scale.

following calipers for the length, width, and height of a rectangular block. 10 20 30 40 0 1 2 3 4 5 6 7 8 9 10 0.1mm 1. Enter the length in mm. 22.5 X 10 20 30 40 0 1 2 3 4 5 6 7 8 9 10 0.1mm 2. Enter the width in mm. Enter an integer or decimal number, with exactly 3 significant figures [more..] 10 8- 20 30 0 1 2 3 4 5 6 7 8 9 10 0.1mm 3. Enter the height in mm. What is the volume of the rectangle block from the question above in mm. Calculator