German ohmmeter from the 1940s.
https://s3-us-west-1.amazonaws.com/h...n_ohmmeter.jpg
Previously:
https://www.homemadetools.net/forum/...894#post160120
https://www.homemadetools.net/forum/...614#post159165
https://www.homemadetools.net/forum/...718#post143728
https://www.homemadetools.net/forum/...823#post137092
https://www.homemadetools.net/forum/...743#post159676
