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For at least 99% of the tube testing you are likely to do, almost any emission tester will do. Just make sure it's new enough to handle the tubes you are likely to encounter.
I use an old Precision. I also have the compactron adapter and never use it. It also tests batteries and pilot lamps; I don't use it for that either. I have the original roll chart and a supplement book. I have added some entries for tubes that are in neither of these references.
Basically, you check for enough emission and for shorts. There are, of course, more sophisticated tests but generally they aren't necessary.
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