I don't mean to rain on Behemot's parade, but
apparently Uni-T meters aren't very good themselves.
Granted, they might give alright performance for the price. But we're talking real
danger if the claimed voltage ratings are taken at face value by the operator. (Do
you trust an M205 glass fuse at Cat IV? Me neither, knowing that they can explode from the fault current available at even a normal household wall outlet.) For what it's worth, so far I have only a bargain-bin meter myself, but at least it doesn't claim to be suitable for mains usage (even though it does have a 500VAC range).