I bought this Voltmeter from a member of a electronic forum. As I opened it, I was kindly surprised. It looked like it came fresh from production. I was even more surprised, when I found no capacitor or something I had to replace. The values of the voltages I measured, matched those in the schematic. That is high quality!!!
The only thing I repaired were the measurement cables.
I googled the relevant datasheets and linked them here, because I don't own them.