I have a old Fluke 8502A bench DMM here. All i can say is that if you don't know how to use such an instrument, you will get the funniest results. And that unit is old. Modern units have at least one magnitude better resolution. Just "looking" at these things introduces huge offsets, if regular wiring/plugs is used.
Heck, even with a decent handheld DMM i can produce results that show a net positive gain of energy, when working on highly reactive loads. But then, a DMM is just not intended for that kind of usage in the first place.
What Rossi did was basically put a Kill-A-Watt into the supply line, somehow "meassure" the delivered energy to the "eCat", and then observe some steam. That does not convince me of anything. If i wanted to, i could rewire your fuse-box to make your meter spin backwards when you turn on the oven. Which, obviously, does not mean that your oven produces energy. All it means is that unless you know the full picture, you can't even begin to describe what that picture is supposed to show.
Greetings,
Chris