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I'm thinking the globe in the center has some form of vacuum tube below it and when the probes are touching something ( old radio?) and the probes are measuring the same, the tube in the globe has a glow that is centered. I remember something like that when testing tubes for old TVs back in the day
Maybe a Model T Buzz Coil tester?
I'm thinking the globe in the center has some form of vacuum tube below it and when the probes are touching something ( old radio?) and the probes are measuring the same, the tube in the globe has a glow that is centered. I remember something like that when testing tubes for old TVs back in the day
Maybe a Model T Buzz Coil tester?