Sean, Excellent question.
My experience with Aliexpress is limited, but excellent. My guess is that all of the 220 leather irons work the same, but the Chinese sellers can’t really test them and are incorrectly estimating the output based on current, when the thermostat which controls the temperature doesn’t rely on current. The resistance heating element just keeps on heating until the thermostat blinks and it cuts power.
I think that any of these tools with the 350 degree dial and thermostat will work with North America 120 volts – just at lower temps than indicated on the dial – and a lot slower to heat up. Fifteen to 20 minutes! Mine goes way past 250 degrees if I don’t have the dial taped down and accidentally bump it!
I really wanted to order one of the sets of 6 (red handles) for $140 thru Aliexpress, but couldn’t justify it for class use, yet.
I found a simple digital instant-read oven thermometer worked to measure temperature. (Instant is a relative term.) Besides you need one for roasts: see my Dutch Oven Campfire Cookbook at http://www.russia-alaska.com , Ha!
Please post your results!
Bruce