It would likely be limited to just the US since copper fish meds have also been banned in Canada (although I'm sure they can still get copper sulfate). With so many people who do treat for copper complaining about the cost of a Hanna checker I can't see many paying 10 times that for an automatic tester.
To my knowledge we can still get copper sulphate and technically we can still get copper we just have to take a chance on ordering it lol Not that Canada is a massive market anyway. And people are willing to pay $1000 for an alk monitoring device I'm sure if it was appropriately priced the potential livestock it would save maintaining proper copper levels throughout QT could save some aquarists a fair bit of money and pay for itself in the short term. And yes I do realize it's very important to maintain steady levels of ALK Cal and Mag all the time in a tank to prevent coral losses which could be thousands but losses in QT can cost some reefers atleast that.
It's funny how people complain about the cost of devices that if properly used can save them tons of money long term with reduced livestock losses.
Like I said it's all hypothetical here. Just something I know I'd be willing to buy along with the Ion Director and the KH Director as I think it would seriously help me with my QT procedures for my new build.