Hello Don:
I have seen those new meters. It looks like it's going to be the thing that replaces the Kill-A-Watt that you mentioned. I have not seen any in the states that would work for 240 VAC though, but if it can be ordered with the correct plug that might make it a bit easier.
One problem though with that is, and I have used the KW devices for many years now so am very well versed with them. They claim they are good for 15 amp etc, but honestly they don't hold up well over time. maybe for a few hours, but extended times, it ends up melting the plug holes, and the board inside overheats and causes heat damage to the thing.
Imagine the plug in the hole in the wall at your house. Yah, sure, it's rated for 15 amps too, BUT what if you were pulling that for hours and hours? The little brass tabs get a bit stretchy, one of the plugs gets a bit of tarnish on it so is not conducting as well,... now we have a heat problem, plastic is melting, wires overheating and oxidizing / crystalizing, insulation overheating etc. You get the idea.
The KaW the current runs through it, the others, there is an external current either shunt / coil, depending on the model you decide to buy. The carrying component is NOT closed up inside the metering compartment.
Another thing and this is probably just me being nerdy. The Kill A Watt you see ONE number at a time and have to flip thru menu's and the labels for what the number is, is tiny and super hard to read. I don't like it. The meter I linked to (TBH I actually like the earlier versions of that meter genre better) all the numbers are right there, no need to sift screens and the labels are a bit easier to read.
Aaron