The Physikalisch-Technische Bundesanstalt is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Energy. More information...
In June 2020 the website ptb.de was on the 3,778th place in the ranking of the most reliable and popular sources in multilingual Wikipedia from readers' point of view (PR-score). If we consider only frequency of appearance of this source in references of Wikipedia articles (F-score), this website was on the 21,285th place in June 2020. From Wikipedians' point of view, "ptb.de" is the 8,824th most reliable source in different language versions of Wikipedia (AR-score).
The website is placed before radiosvoboda.org and after juridicas.com in multilingual PR ranking of the most reliable sources in Wikipedia.
BestRef shows popularity and reliability scores for sources in references of Wikipedia articles in different languages. Data extraction based on complex method using Wikimedia dumps. To find the most popular and reliable sources we used information about over 200 million references of Wikipedia articles. More details...