Several radiometers used on Kilimanjaro AWS are made by the Dutch company Kipp & Zonen. Coincidentally, they were all transported to Tanzania aboard Royal Dutch Airlines (KLM).
The Kipp & Zonen website has just published an overview on Kilimanjaro, our climate studies, and why it is such a great place for climate research. The article contains several images and discussion of the following plot. Intrigued? Check it out here.
[UPDATE 5/5: A more-detailed version of this overview appears in the April edition of Meteorological Technology International - a very interesting trade publication. A link to just the 4-page article with photos is available here.]
(This is blog post #100!)