I had to lug one of those about Ant, during my days in The City. Weighed a ton and had a battery life of at least 30 minutes. The battery looked like something pinched out of a car.
When I was out at clients there was a time when I'd be carting a laptop and it's bits, my PDA and it's bits and my phone and all it's bits around with me, and all the paperwork associated with the job. About the same weight as an average three year old. My muscles had muscles in those days. Now, I have a smartphone that I'm very happy with, my tablet of course and the lappy. The only one I carry everywhere now is the phone, I'll take the tablet if I need a larger screen for something. The lappy stays at home for the most part.
I'd be interested in this meter, if only because it looks more portable than my current beast and all it's paraphernalia. And then too, I'm a technophile, I just love gadgets... Provided I can see the usefulness of them.