I think unless you need Micron accuracy, which is highly unlikely, considering we're playing with Wood on this forum and it's a natural product. It's highly unlikely that it will ever need be accurate to anywhere near that level.
The €10 or 10 GBP pair from Lidl or Aldi are perfectly adequate for 99.9% of woodworking jobs, and even if you have to add a piece of metal into the equation again, it's highly unlikely that you would be looking for that sort of accuracy. In fact most people wont have the tools at home to be working to that level anyway.
As a retired engineer, I do have those tools along with a Lathe and Mill in my workshop over here in Spain and it's very rare even when I Turn or Mill metal that I need anywhere near the accuracy of the tools that I have.
I'm not making parts which need to fit together as if they were meant to have a zero tolerance because that's what we're basically talking about here at the micron level. There seems to be a tendency now by some people to spend large sums of money on pieces of kit that don't require it, Its almost like were building a snob value in to our hobbies now
!!
I've tested my cheap Vernier from Lidl against my more expensive engineering one and they are fine for carpentry by a long way.
The main thing you should worry about is that your squares, table saws, rulers, CNC, Mitre saws Thicknesser and or planer blades are accurate rather than your Vernier being out by .001/2/3 of a millimetre.
Concentrate your efforts and money on things that really matter and make a real difference
That'll be me then!
