folding rulers

Something pretty satisfying about stretching one of these out then doing the concertina dance at the end and snapping it shut. What is your poison?? The wood rule w/ graduated 6" extension slide... or the old bi-swing 3-footer with brass joints. How about bombproof fiberglass (had to be called Rhino right)? Folding ruler prawn below. Start w/ the Hultafors Downy Birch, they practically invented the folding ruler, further reading.

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