Thanks for that hint.
Too expensive, though. Seems to be an accredited cal lab.
4ppm DCV, 15 ppm 10kOhm, 50ppm Vac only.
Not very promising for 1281 DAkkS calibration - Lab is not capable to do properly.
I fetched several electronics kits (elektor) from Stolberg, I think, same road there, maybe 30 years ago
Our daughter was born the next village.
Anyhow, no deal for me.
Frank