Though I'm retired, I'm still allowed to work a few hours a month in the film/video business. The Hioki clamp on is a very popular meter, since as Dave deduced, its super THIN and LIGHT. Most of the electricians/lamp operators have Fluke meters, but as we are mostly testing 120/240 volt 1600-1800 amp. mobile tractor generators the Hioki clamp-on gets the job done, and they hold up well. These generators have a single digital gauge, but only for each of the 3 hot phases, plus neutral. Since there are multiple taps for separate cable runs to the set, the clamp on allows for separate amp readings on each hot leg, to keep the diesel geny in balance. We don't require much in the way of accuracy in our meters, except for checking for solid 60 hertz output. The largest gauge cable we need to monitor for amps would be 4/0, so we don't usually read more then 300 amps on a hot leg. Back when I started, analog Amprobe clamp on meters were the standard, I still have mine, bullet proof, and good enough for the task at hand.
A few weeks a go, I was able to bring my new EEVBLOG BM235 to a job, and it performed flawlessly! I compared it to some of the guys Fluke meters, 3 of them, all about 3-4 times as expensive. I compared the basic AC voltages and hertz, all spot on. I had hertz/cycle issues with that generator all day, and the record feature was as good as the fluke 87. Turns out according to the rental house, that generator was switched from regular diesel fuel, to BIO diesel, and it didn't like it.