Interesting to see all thoes heavy duty provin unit/meters. In comparison they seems massive compared to my fluke t6-1000 pro, 325, 101 and milwaukee auto meter 2213-20. Currently I can get a m12 surge and milwaukee meter I'm that back pocket with extra leads and algator clamps. I don't even know if eu meters work over here and vice versa. It seems like proving units can be huge and bulk but I know your required to use them. When I did 480v 3 phase in a factory (cnc and presses) our fluke fork 378 was all we needed to do our job. I'm very curious if you need 3 or 4 meters to do a job or just a assortment or meter the day shaking it up? I've always been curious of the differences overseas tools and methods.