Tube tester link

[hrballenger]

Not mine, no affiliation. Just happened to notice while surfing...

http://www.shopgoodwill.com/auctions/Vintage-Century-Fast-Check-Tube-Tester-Model-FC-2-6393645.html

 

[Thespeakerdude8]

Cool, thats a Mercury, but its not a GM tester- looks like a simple emissions tester. I've got a Mercury 1000, and it does a GM test.