www.kunz-precision.ch
Kunz precision AG (Zofingen, Switzerland)

www.metas.ch
Federal Institute of Metrology METAS METAS test report for goniometer G-1L METAS test report for goniometer G-01L METAS Calibration Certificate of Electronic Autocollimator AE-025

www.cem.es
CENTRO ESPANOL DE METROLOGIA (CEM), Madrid, Spain

www.inrim.eu
Istituto Nazionale di Ricerca Metrologica (I.N.RI.M.) (Italian National Institute of Metrological Research)

www.ptb.de
Physikalisch-Technische Bundesanstalt (PTB) - The National Metrology Institute of Germany

www.eso.org
European Southern Observatory

www.iae.re.kr
Institute of Advanced Engineering (South Korea)