ESD wrist strap tester

This ESD wrist strap tester has been hanging on the wall of the shop at work fo many years, and recently it stopped working.

Which gives me the chance to bring it home and see what's inside!

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it. ... https://www.youtube.com/watch?v=_LEGag9zawM