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Have a read of this: https://www.lfgss.com/comments/13917310/incontext/?utm_source=notification&utm_medium=email&utm_campaign=reply_to_comment
Those ones I've got seem pretty great but they've not had a massive amount of use. I'd say they were worth the <£20. You can get cheaper ones but it's a on gamble as to the accuracy and design. Aldi/Lidl have them occasionally which might be your best bet for cheapo ones.
frankenbike
i keep seeing vernier calipers in this thread. do people get those cheap digital ones off ebay? are they good?