Just checked again between voltage reference and owon oscilloscope:
And it’s the same:
But it wasn’t the same for Owon B41T+, I didn’t took photos, but it was, so I decided to calibrate B41T+ a bit, there is a resistor to tune dc measurement:
VR2:
It’s interesting that this DMM should «warm up» a bit before measurements will be correct, but looks like I’ve fixed the difference:
