Whilst not strictly bike these seem a reasonable buy this coming Thursday being stainless steel as opposed to the usual plastic for cheap digital calipers. https://www.aldi.co.uk/workzone-digital-caliper/p/094154097085000
I'd loved to be proved wrong (I wouldn't), but I'm pretty sure you'll find that the body is plastic the same as all the other digital calipers you'll find on eBay for slightly less: just silver coloured, not black.
I was referring to the jaws rather than the body as many of the cheap ones have plastic/ probably pseudo carbon fibre jaws.
If plastic one like this.
http://www.ebay.co.uk/itm/LCD-6-150mm-Digital-Micrometer-Vernier-Caliper-Gauge-Accurate-Measurement-Tool-/361765822343?var=&hash=item543aec5f87:m:mFtI7zksT49WC6CEZuAB2Aw
Have to be honest tho the screws on the ruler part in the aldi pic make me think it will be metal.
@Scilly.Suffolk started
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Whilst not strictly bike these seem a reasonable buy this coming Thursday being stainless steel as opposed to the usual plastic for cheap digital calipers.
https://www.aldi.co.uk/workzone-digital-caliper/p/094154097085000