DIN ISO 17123-1:2017 Optics and optical instruments - Field procedures for testing geodetic and surveying instruments - Part 1: Theory (ISO 17123-1:2014)
2017DIN ISO 17123-1:2017 Optics and optical instruments - Field procedures for testing geodetic and surveying instruments - Part 1: Theory (ISO 17123-1:2014)
1990DIN 18723-1:1990 Field procedure for precision testing of surveying instruments; general information