I couldn't agree more (the piccies were just to 'prove' that it still works, some 55 years on ).There's no way on earth you can compare a piece of far eastern cr4p with an AVO Multiminor
However, I was making the point that long before we knew about CAT III/IV markings, meters could be safe to use. I also have some "far eastern cr4p' meters of a similar vintage which still work, and which I would also be happy to use for measuring mains voltages.
Kind Regards, John