Film shrinkage gauge to determine if the film is safe to view on machines with sprocketed drives.
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More:
https://amianet.org/wp-content/uploa...ge-About-1.pdf
Previously:
https://www.homemadetools.net/forum/...181#post145706
https://www.homemadetools.net/forum/...020#post112166
https://www.homemadetools.net/forum/...172#post172493
https://www.homemadetools.net/forum/...748#post163494
https://www.homemadetools.net/forum/...549#post136091
