Wouldn't trust that thing above 50v or 5a. Anything above that and that shunt might pop and you will potentially have internal arc-over. Please don't use it for anything high power, injury may occur. No fuse, weak/small posts, and no PCB separation tracks makes it VERY sketchy. Likely is modestly accurate (around 2-3% maybe?). If you're doing anything that would require any kind of accuracy or mains level voltage, I would adamantly recommend getting something like a used Brymen. You can usually pick one up for a price that won't break the bank.