One reason I dont mind spending on decent multi meters, is that I used to use cheapies. And had several 3 phase pottery kilns, with 440V elements etc. These were truck sized, and I made the mistake of assuming that cheap Chinese meters rated for 600V safety, actually were. I had one explode and arc in my hand just on 440V AC. So do not believe it! Nobody hurt but with 3x 250A fuses on the large kiln there wasn't much trouble smoking it in a second.
My flukes are tested and safe at 600 and 1000V and I trust them. I wouldn't even use a cheap Chinese one on the 240V mains we get in a house.
Having had this happen I know its very real. Not a way to sell meters. Transients or spikes happen! It was a busy industrial estate. Interesting reading here:
https://www.grainger.com/content/safety ... multimeter