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This bicycle repair kit I bought from LIDL comes with all the same tools as the famous Wera Tool-Check Plus but costs 11€
(i.imgur.com)
10x cheaper than the original. Likely not Wera quality but probably not 10x worse either. I've been quite happy with the other Parkside tools I've got.
It's most likely a difference in steel. Cheap steel fractures and wears down, but if you're only using it once a month or a year, you can probably get by. If you're using it every day, it probably won't work for you.