Calipers, attachment for a ruler
thingiverse
A caliper model (available at http://www.thingiverse.com/thing:48413) was printed and later modified to fit over a pre-existing metal ruler; this ruler measures 26.5mm in width and 1mm in height. The design accommodates these specifications. Sketchup files are also provided for potential customization. However, the top of the caliper covers 1cm of the ruler, thus necessitating a subtraction of 1cm from the measured length.
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