vernier scale

1. A small, movable auxiliary graduated scale attached parallel to a main graduated scale and calibrated to indicate fractional parts of the subdivisions of the larger scale. Vernier scales are used on certain precision instruments to increase accuracy in measurement.

Example Sentences

A slide is made to play upon it with a vernier scale, graduated to hundredths of an inch.

From Project Gutenberg

It is provided with a vernier scale graduated to hundredths of an inch.

From Project Gutenberg