I was searching and found the internals appear to be the same for 120/240 on some of the models.
"Higher ratings of 100-277v, 50/60Hz, and 20 amps require appropriate country specific cord set and receptacle, and is NOT UL listed. Internal electronics are the same. "
That was from this website, and they also have the manuals for download.
https://www.powermeterstore.ca/p5674/eed_watts_up_net.phpThe 220/240 part's pretty odd. I won't try to push 240/220 through these for an extended period of time if I get one, then. I wasn't able to find specifications or manuals for these devices, thank you for the link. I'll probably just put a small GPU rig on one and see how it works, shame the company that made these stopped supporting these things.