Well, in the past they used Metrix/Chauvin Arnoux and labeled these, but were more expensive than Metrix....
It could be the C.A. 5220. Too bad, I have used Metrix in School and also have an old Metrix AC/DC Current clamp and these parts were/are good.
I wouldn't buy DMM's or scopes from a tools manufacturer as this is just not their business, so they have to label it somehow.