These are newspaper and magazine articles, mostly not in English.
1-0. Article in German Newspaper NRZ
This article was published in NRZ newspaper in June 2017.
2-0. NRZ 2014-03
3-0. Rheinische Post 2014-06
Hydrosight in a local newspaper. Thanks Hanna Robertz for the nice article and Markus van Offern for the photo.