1920s steampunk Roller-Smith HTD circuit tester & ohmmeter

The Roller-Smith HTD is a simple but effective circuit tester and ohmmeter that is still accurate today, nearly a century later after it was first made. An ad announcing it is on page 4 of this radio engineering periodical from August 1927: https://worldradiohistory.com/Archive-IRE/20s/IRE-1927-08.pdf

#antique #ohmmeter #steampunk

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