DOI: 10.22184/1993-7296.FRos.2022.16.6.464.474

Nowadays, high-precision angle measurement is necessary in many fields of science and industry. Precision angle measurements are especially important when checking and controlling various optical parts and angular measures. One of the most accurate devices at the moment is a goniometer, which allows you to measure angles by non-contact methods. This article discusses various types of null-indicators used in goniometric systems, their advantages and disadvantages are indicated. The review is intended to provide a basic understanding of goniometric systems and null-indicators used in angular measurements.