Info needed on seco tube tester

[Tubejunke]

I had one of these given to me by the business that used to have it on their floor. Like yours, the needle was broken in the meter. I had other portables and this one was so bulky I never did much with it and finally gave it away.

I think it's interesting how instead of having all of the various settings that a professional model would have, they were forced to dumb it down for public use and just point you to one of the many identical sockets. Black knob; gray knob; socket number go! LOL! I would hate to have had the job of hard wiring all of those sockets when those were being produced!