Digital rolling ruler.
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Previously:
https://www.homemadetools.net/forum/...342#post173202
https://www.homemadetools.net/forum/...952#post156773
https://www.homemadetools.net/forum/...561#post143121
https://www.homemadetools.net/forum/...9580#post89618
https://www.homemadetools.net/forum/...451#post173677
