Thickness measuring tool for 4 cm thick
Description
This is a thickness measuring tool (gauge or ruler) for 4 cm thick. I usually use Mercari as an online flea market service. And I send many parcels. Parcels thickness is limited to 4 cm (slot size of postboxes) on Japan Post. So I designed this one. You can see the detail (in Japanese). https://arundolon.hatenablog.com/entry/2022/03/06/225334
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