Bridge deck displacement tester.
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Previously:
https://www.homemadetools.net/forum/...401#post161947
https://www.homemadetools.net/forum/...768#post102413
https://www.homemadetools.net/forum/...945#post156737
https://www.homemadetools.net/forum/...750#post148091
https://www.homemadetools.net/forum/...455#post146916
https://www.homemadetools.net/forum/...494#post142942
https://www.homemadetools.net/forum/...109#post141264
https://www.homemadetools.net/forum/...444#post122429
https://www.homemadetools.net/forum/...222#post116006