With the rise of digital measures, Vernier scale for tools like calipers and micrometers are used less and less. The Vernier Scale was named after a French mathemetician, Pierre Vernier, in 1631. The Vernier scale uses the ability of the human eye to detect alignment of two lines, this is referred to as Vernier acuity. A Vernier scale consists of an evenly divided fixed scale plus an indicating scale with divisions slightly smaller than the fixed scale. Commonly the Vernier division is 9/10 of the fixed scale divisions. The measurement is taken at the zero point of the indicating scale but this usually falls between two numbers on the fixed scale. The next number in the measurement comes from the Vernier or indicating scale at the point where it exactly lines up with a division on the fixed scale.