Vernier scale | Vernier scale

Key Words: manual metrology, micrometer, caliper

Definition:A secondary scale, which when read adjacent to a primary scale, allows more precise readings of the smallest divisions (usually a tenth) on the primary scale

TECHNOLOGY:

The Vernier scale, also sometimes called a nonius, was invented by a French mathematician Pierre Vernier (1580 – 1637). The secondary scale (usually sliding) of the Vernier scale indicates where a measurement lies when it is in between two marks on a primary scale. Vernier scales can be used in linear and circular measurement applications and often include both metric an imperial dimensions. Vernier measurements can provide precision to a hundredth of a millimeter or one thousandth of an inch. Measurement accuracy is highly dependent on the skill of the operator, however, as measurement is subject to parallax effects and distortion due to either the elasticity of the measurement tool and / or the sample.

APPLICATIONS:

Vernier scales are common in many metrology applications. They are used on sextants, theodolites, scientific instruments and measuring tools such as calipers and micrometers and allow measurement with greater precision.