Wet film thickness measuring tool.
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Previously:
https://www.homemadetools.net/forum/...217#post130586
https://www.homemadetools.net/forum/...428#post162059
https://www.homemadetools.net/forum/...631#post147559
https://www.homemadetools.net/forum/...041#post140930
https://www.homemadetools.net/forum/...032#post137890
