Magnetic thickness gauge.
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Previously:
https://www.homemadetools.net/forum/...118#post168690
https://www.homemadetools.net/forum/...395#post158359
https://www.homemadetools.net/forum/...453#post154787
https://www.homemadetools.net/forum/...820#post148359
https://www.homemadetools.net/forum/...989#post156973
