> The funny thing is, meanwhile I found a power supply which was part of a
> "Raspberry 2 starter kit" from Vilros. This one delivers 5V and 2A also,
> but in reality, there are 5.37 Volts without load, measured with the
> device above.
> Surprisingly RPi did not complain about "over voltage".

I purchased my RPi2 from Vilros and have been using their included power
supply with no issues for about 4 years now.  I was actually going to
suggest that you check to see if you could get a PSU from them, or from
Canakit.

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 * SLMR 2.1a