I will open this Hioki to see inside 1 year from now, since it is still under warranty.
We know what your Hioki 4212 (ODM/OEM is DER EE DE-240) looks like inside via
https://www.eevblog.com/forum/testgear/hioki-4212-multimeter-pictures/
I have seen that too..
hmm..I might have mixed up my memories, I thought that was Hioki 4211 or well I do not know.lol
Maybe because I have browsed to many DMM reviews in this forum.lol