English Calipers Cited by user Cmglee on 28 Mar 2024 Caliper(s) or calliper(s) are an instrument used to measure the dimensions of an object; namely, the diameter or depth of a hole.
English Abbe error Cited by user Citation bot on 11 Sep 2018 Abbe error, named after Ernst Abbe, also called sine error, describes the magnification of angular error over distance.