Regarding the cheap multimeter robustness testing, this might be an interesting specimen.
Fnirsi DMT-99
https://www.aliexpress.com/item/1005006225669621.htmlNot that I expect it to be very robust, being a cheap (chinese) meter, but it's not from a typical DMM manufacturer (so who knows....) and it has an interesting feature that it can do some graphical logging. (quite unique in this price range)
It's one of those automatic style meters though, so I expect it to be a nuisance to use
It's quite a new model, so there's not that much info on it out there (1 or 2 youtube reviews though).
But.... I haven't seen any CAT rating on the meter (in the youtube reviews) or in the manual, nor any compliance to an EN standard, so that might be interesting
I think that would make it illegal to sell here in the EU at least (I think compliance to EN61010 for devices that can be connected to mains, including multimeters, in the EU is mandatory)
Best wishes for the New Year