Mpumalanga International Airport - July 2001 - ABB South Africa - SA Instrumentation & Control. www.instrumentation.co.za. [2018-08-24]. (原始内容存档于2020-05-17).
Systems, University of Paderborn 维基共享资源中相关的多媒体资源:日射强度计 Meteo-Technology instrumentation website (页面存档备份,存于互联网档案馆) World Radiation Center (页面存档备份,存于互联网档案馆)