| http://www.w3.org/ns/prov#value | - I think your best bet is to mimic the design of electronic digital calipers - here is a link to some pictures of the insides of one http://www.adafruit.com/blog/2010/11/08/digital-calipers-tear-down/ You might be able to modify a cheapo chinese one but you will pay a fair bit for a long one.
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