Large 500mm long jaw vernier caliper.
https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...343#post122020
https://www.homemadetools.net/forum/...684#post147799
https://www.homemadetools.net/forum/...661#post190008
https://www.homemadetools.net/forum/...226#post150022
https://www.homemadetools.net/forum/...251#post150147
