Typically a power meter you haven’t heard of and is really cheap… gives the kind of data you’d expect. And you’ll typically get the user support you’d expect, if any at all.
The materials to make a power meter are relatively cheap. Making one that works and staffing a company to support it isn’t cheap.
IQSquared was an indication that people really REALLY want cheap power meters. Even when they don’t exist they’ll spend money on them.
There’s a LOT of proven power meters on the market you can buy with confidence.
If one of these comes across my desk, I’ll put it though my testing protocol and let the data speak for itself.